ARM: dts: msm: Add linux,contiguous-region for 8x10 PIL regions

PIL is now being migrated from Ion to using CMA regions. Add
the phandle reference to the CMA regions for later use. This has
no effect until dma_alloc is called.

Change-Id: Iec2108d484178e457e44b03bbe11c2322734039f
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>