Convert gralloc.default to soong

Convert hardware/libhardware/Android.mk to Android.bp and due to the if
condition for GRALLOC_FRAMEBUFFER_NUM is never being used, remove the if
condition for the converted Android.bp.

Bug: 356533884
Test: m gralloc.default

Change-Id: I99dc7c4e203fd743b3d64b2d98fd9231297ea076
3 files changed