msm: Add support for relocatable pil ion heap

To specify the address and the size of memory which has been removed
add bindings for fixed memory. This specifies the size and the address
of the memory which has been previously removed by memblock remove.

Enable relocatable PIL heaps using ion framework. There are two PIL
heaps to meet the different set of requirements of the PIL firmawares.

Change-Id: Ief27c45f5d20f8afde121b838a5cd228d5b32e5d
Signed-off-by: Neeti Desai <neetid@codeaurora.org>