Set standby as false when the stream is started successfully.

When the audio patch is created and the stream is started, set the
standby as false. In that case, if there is a simultaneous request for
read or write data, it is no need to start the stream again.

Bug: 212509560
Test: repo steps in the bug
Change-Id: Ic3dbab3134bc761271b6b2ac8619135ef08075bc
Merged-In: Ic3dbab3134bc761271b6b2ac8619135ef08075bc
1 file changed