HAL3: fix the AE AF region default value
HAL3: fix the AE AF region default value

The Weight need to be zero to indicate that it's up to HAL to decide the
AE/AF strategy.

Bug: 17334452
Change-Id: I452790ff45f4f34fd5b3b68eb8c47f3c2c66c988

maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead