gpu: ion: Pull in patches for 3.4

Pull in Ion patches for 3.4 upgrade. Inclues the following
patches from google:

 commit 7191e9ba2508ca6f1eaab251cf3f0a2318eebe26
 Author: Rebecca Schultz Zavin <rebecca@android.com>
 Date:   Mon Jan 30 14:18:08 2012 -0800

     ion: Switch map/unmap dma api to sg_tables

     Switch these api's from scatterlists to sg_tables

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>

 commit 6f9e56945d4ee3a2621968caa72b135cb07e49c4
 Author: Rebecca Schultz Zavin <rebecca@android.com>
 Date:   Tue Jan 31 09:40:30 2012 -0800

     ion: Add reserve function to ion

     Rather than requiring each platform call memblock_remove or reserve
     from the board file, add this to ion

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>

 commit 9ae7e01de1cf03c77054da44d135a7e85863fcb0
 Author: KyongHo Cho <pullip.cho@samsung.com>
 Date:   Wed Sep 7 11:27:07 2011 +0900

     gpu: ion: several bugfixes and enhancements of ION

     1. Verifying if the size of memory allocation in ion_alloc() is aligned
     by PAGE_SIZE at least. If it is not, this change makes the size to be
     aligned by PAGE_SIZE.

     2. Unmaps all mappings to the kernel and DMA address spaces when
     destroying ion_buffer in ion_buffer_destroy(). This prevents leaks in
     those virtual address spaces.

     3. Makes the return value of ion_alloc() to be explicit Linux error code
     when it fails to allocate a buffer.

     4. Makes ion_alloc() implementation simpler. Removes 'goto' statement and
     relavant call to ion_buffer_put().

     5. Checks if the task is valid before calling put_task_struct() due
     to failure on creating a ion client in ion_client_create().

     6. Returns error when buffer allocation requested by userspace is failed.

Signed-off-by: KyongHo Cho <pullip.cho@samsung.com>

 commit 043a61468f395dd6d4fc518299726955e9999c59
 Author: Rebecca Schultz Zavin <rebecca@android.com>
 Date:   Wed Feb 1 11:09:46 2012 -0800

     ion: Switch ion to use dma-buf

     Ion now uses dma-buf file descriptors to share
     buffers with userspace.  Ion becomes a dma-buf
     exporter and any driver that can import dma-bufs
     can now import ion file descriptors.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>

 commit 0d1259b5f84969bd00811ff9faa1c44cdb9fdbb5
 Author: Rebecca Schultz Zavin <rebecca@android.com>
 Date:   Mon Apr 30 16:45:38 2012 -0700

     gpu: ion: Use alloc_pages instead of vmalloc from the system heap

     With this change the ion_system_heap will only use kernel address
     space when the memory is mapped into the kernel (rare case).

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>

 commit be4a1ee79a89da3ca705aecc2ac92cbeedd032bd
 Author: Rebecca Schultz Zavin <rebecca@android.com>
 Date:   Thu Apr 26 20:44:10 2012 -0700

     gpu: ion: support begin/end and kmap/kunmap dma_buf ops

     These ops were added in the 3.4 kernel.  This patch adds support
     for them to ion.  Previous ion_map/unmap_kernel api is also
     retained in addition to this new api.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>

 commit 46d71337f9aa84694e4e6cca7f3beb6b033bbf76
 Author: Rebecca Schultz Zavin <rebecca@android.com>
 Date:   Mon May 7 16:06:32 2012 -0700

     gpu: ion: Allocate the sg_table at creation time rather than dynamically

     Rather than calling map_dma on the allocations dynamically, this patch
     switches to creating the sg_table at the time the buffer is created.
     This is necessary because in future updates the sg_table will be used
     for cache maintenance.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>

 commit 903f6c716db3d4e26952aae9717f81dd5bc9e4ba
 Author: Rebecca Schultz Zavin <rebecca@android.com>
 Date:   Wed May 23 12:55:55 2012 -0700

     gpu: ion: Get an sg_table from an ion handle

     This patch adds an interface to return and sg_table given a
     valid ion handle.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>

The commit also includes fixups needed for MSM specific code.

Change-Id: Idbcfa9d6af0febf06f56daaa6beaa59cc08e4351
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>