ANDROID: GKI: drivers: video: backlight: Fix ABI diff for struct backlight_device

The following members are added to struct backlight_device:
struct thermal_cooling_device *cdev;
int thermal_brightness_limit;
int usr_brightness_req;

Change-Id: I1405ddd6c3cfff99cd84842d3773851168dcfe78
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>
(cherry picked from commit 6cd31b3ff45ab44f3624e9139a0602e3a1a6f9ea)
[connoro: commit amended to include only ABI diff]
Bug: 153189857
Signed-off-by: Connor O'Brien <connoro@google.com>