Add callback for output stream.

The callback is targeted for events related to an output stream.
Currently, there is one callback event defined, which is codec
format changed event.

Bug: 133526565
Test: manual
Test: atest VtsHalAudioV6_0TargetTest
Change-Id: I73a4914c1ffc30e1c88b8fedd61a031e24a069f6
diff --git a/current.txt b/current.txt
index d4984c2..ddf4764 100644
--- a/current.txt
+++ b/current.txt
@@ -611,8 +611,9 @@
 bca5379d5065e2e08b6ad7308ffc8a71a972fc0698bec678ea32eea786d01cb5 android.hardware.audio@6.0::IPrimaryDevice
 fd1f1b29f26b42e886220f04a08086c00e5ade9d7b53f095438e578ab9d42a93 android.hardware.audio@6.0::IStream
 2df5d5866b37776f25079c0e54b54350a2abe4e025a59c9e02a7d3abe8ca00e8 android.hardware.audio@6.0::IStreamIn
-e6cd2b7c1a86b6ca683c0224ffde3b73aa14f6487de9f46833e539d26d1b3b5c android.hardware.audio@6.0::IStreamOut
+164826a380f4c1700183003f62d7532e367b67381c30ea44f946c0cf00008f85 android.hardware.audio@6.0::IStreamOut
 997fdaad7a9d17ee7e01feb7031a753e2365e72ad30b11d950e9183fabdf3844 android.hardware.audio@6.0::IStreamOutCallback
+e7ca0db9a1098210f327a9b152fa6afe6bf019c41e5264c64829d04d50c0a526 android.hardware.audio@6.0::IStreamOutEventCallback
 bee662c62d997d8065e2bcb5c1e7a9578931f22ce28fd02c219fdb4d0630abf7 android.hardware.audio.common@6.0::types
 817930d58412d662cb45e641c50cb62c727e4a3e3ffe7029a53cad9677b97d58 android.hardware.audio.effect@6.0::types
 525bec6b44f1103869c269a128d51b8dccd73af5340ba863c8886c68357c7faf android.hardware.audio.effect@6.0::IAcousticEchoCancelerEffect