Replace kProducerStateBit with kFirstClientBitMask.

kProducerStateBit covers the MSB of the buffer/fence state.
kFirstClientBitMask covers the LSB of the buffer/fence state.
This change replaces the kProducerStateBit with kFirstClientBitMask, and
update the kConsumerStateBit to be the inverse of kFirstClientBitMask.

Test: AHardwareBufferTest BufferHubBuffer_test BufferHubMetadata_test
buffer_hub-test buffer_hub_binder_service-test buffer_hub_queue-test
buffer_hub_queue_producer-test buffer_node-test dvr_api-test
dvr_buffer_queue-test dvr_display-test libgui_test libdvrcommon_test
pdx_tests GraphicBuffer_test
Bug: 118718713
Change-Id: I647f36ee3fb2eb5dc996b781ed0ff71f7f72c112