Fix file permissions

Change-Id: Iffc2941d98ee16796cf3d44dec1cfa376d9362bb
diff --git a/include/hardware/bluetooth.h b/include/hardware/bluetooth.h
old mode 100755
new mode 100644
diff --git a/include/hardware/bt_rc.h b/include/hardware/bt_rc.h
old mode 100755
new mode 100644
diff --git a/modules/audio_remote_submix/audio_hw.cpp b/modules/audio_remote_submix/audio_hw.cpp
old mode 100755
new mode 100644