libui: use IMapper::createDescriptor_2_1

Update using's in Gralloc2.h to be based on common@1.1 and
mapper@2.1.  Use IMapper::createDescriptor_2_1 when it is available.

Test: manual
Change-Id: Id4f805a93a5e9a6cde9ecece7dd4954dec337060
2 files changed