huashan: overlay: move packages/Camera to packages/Gallery2

Change-Id: I1b760ece868eecffbff75f360613a14e19f07d40
Huashan: fix brightness values

Our driver supports a max lux value of 1024 (like blue platform) but even
under inder intense light the sensor will only ever report a max of 1023.

Change-Id: I07a9d2da6efc7b22b1853ee2fd166597ab8b8b4d