cec: support standby features for tx/rx [1/1]

cherrypick ag/4808863

Bug: 112553298

When press power key on soundbar, CEC type is 5(audio system),
it will send command to tx and rx devices to let them go to standby mode

Test: Tested with a TV
Change-Id: I242fb1028b5ae003e6054fe9b54e10d1f433374c
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index ac57d20..68b08f9 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -269,6 +269,7 @@
                     Settings.Global.GNSS_SATELLITE_BLACKLIST,
                     Settings.Global.GPRS_REGISTER_CHECK_PERIOD_MS,
                     Settings.Global.HDMI_CONTROL_AUTO_DEVICE_OFF_ENABLED,
+                    Settings.Global.HDMI_CONTROL_AUTO_TV_OFF_ENABLED,
                     Settings.Global.HDMI_CONTROL_AUTO_WAKEUP_ENABLED,
                     Settings.Global.HDMI_CONTROL_ENABLED,
                     Settings.Global.HDMI_SYSTEM_AUDIO_CONTROL_ENABLED,