Set standby as false when the stream is started successfully. am: 041a7d90dd am: 3f274495a7

Original change: https://android-review.googlesource.com/c/platform/hardware/libhardware/+/2572211

Change-Id: I8edd5627b4df495915dee70609a11d9e9be6635d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>