Add observer to bufferpool clients
Bufferpool clients are notified bufferpool events via FMQ messages. Usually the messages are processed by pipeline via piggybacking. To ensure process FMQ messages even if the process is in idle state, Observer hidl interface is added. Buffer invalidation caused by pipleline completion uses Observer interface in order to invalidate buffers after all normal operations are finished. Bug: 112203066 Change-Id: I2a4a172d78c6bcedcc809c559321929ebc91c30d
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