Minor updates AHardware accessor in AImageReader

1/ Be more explicit about what usage/format combination is supported.
2/ Get rid of usage1 following the same change in AHardwareBuffer.
3/ No more gralloc1 usage, so don't call android_convertGralloc1To0Usage
anymore.

Bug: 35114769
Bug: 37097572
Test: Ran AImageReaderCts
Change-Id: Ic712d0ac5bd86b2c4c68815125ba9037212dfd65