[automerger] Init gain config to prevent uninit leak. am: ebe0777edc am: 1f39e79a73 am: f57d4e10ef am: 3fc94f3a7f am: e279da4090 am: 7a41b25ce7 am: 3c5a6f0638

Change-Id: I3d0c843a2b28b15236858bfab1a8bf192a121f00