Camera3: Advertise available shading modes.
Camera3: Advertise available shading modes.

Update static metadata and advertise
available shading.available modes and availablelensshadingmap modes.
Also add the same to availableCharacteristicsKeys.

Bug: 20087681
Change-Id: I8253275afdf3c1300245243bf1c705b24da87308

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