Fix AHardwareBuffer 10:10:10:2 format

Rename this format to match the component ordering we use in the other
formats (RGBA, in LSB to MSB order), and associate it with the right
Vulkan format (A2B10G10R10_UNORM_PACK32, not the BGRA-order
A2R10G10B10_UNORM_PACK32): the former is required in Vulkan while the
latter isn't, and it makes sense for us to be consistent with that.

Also use the _FLOAT suffix for the 4xFP16 format, not _SFLOAT; we don't
use the latter anywhere else and we don't have unsigned floats.

Bug: 37515907
Test: make checkbuild
Change-Id: I4f9e5e39ddef41d373290c26c92d5b94a884a740