Add support for the GRALLOC_USAGE_EXTERNAL_DISP and the
GRALLOC_USAGE_PROTECTED usage bits. If any of the two usage bits are
set, we need to send the buffers to the overlay.
Since we send the buffers to the overlay, we need to allocate these
buffers from the PMEM region.
(cherry picked from commit 195345cd63f0e19cfee4cf055587d5fffe76d0ef)
Change-Id: I64116b9be07c8ddadbd5a132ef21b19e5326737b