ui: Rework GraphicBuffer + Allocator for 64bit usage

Removes gralloc1-style flags, and replaces with HIDL-style single 64bit
usage. Internal storage of the usage is still 32bit; to be addressed
with a future change.

Change-Id: I60062208cbb06bc8cf6c293e7c7e1530c1147912
Bug: b/33350696
Test: Bullhead: booted to launcher, take photo, watch youtube