ACodec: Correct kVideoGrallocUsage to BufferUsage HIDL format

ACodec used the combination of usage bits in kVideoGrallocUsage before
VIDEO_DECODER usage bit had been defined. The patch corrects
kVideoGrallocUsage to BufferUsage::VIDEO_DECODER for the modern
definition.

Bug: 171544272
Test: CtsMediaTestCases
Change-Id: Icd84fb76173d52a43858f5b597fdaf43a53ab005
1 file changed