memshare: Port and add snapshot of changes from msm-3.10

Port the memshare driver and apply the following memshare driver
changes taken from msm-3.10 kernel branch as of msm-3.10 commit
4493220f	memshare: Boot time allocation and handling
		multiple clients
2ae4997a	memshare: Donot re-allocate the memory for the
		clients
059dcd59	memshare: Do not overwrite the response for the
		failure case
ed6d183f	memshare: Change the compatible property field
		for child node
b473fc4e2	memshare: Free the memory after XPU unlocking is
		done
95c114c39	memshare: Add query size api support for clients
60f310d4e	memshare: Change dma attribute to
		DMA_ATTR_NO_KERNEL_MAPPING
73075545	memshare: Remove local connection status variable
98dd2908	memshare: Place error check to prevent out of
		bound access

Change-Id: Iecf0a9828efd1d56c309a2af882c13ce36e7fc06
Signed-off-by: Katish Paran <kparan@codeaurora.org>