Camera: add TARGET_PROVIDES_CAMERA_HAL

This allows qcom devices (such as msm8960 devices) to use a different camera hal.

Change-Id: If915446620a3afb32a23694f183263c4439eda93
Merge tag 'android-4.4.1_r1' into HEAD

Android 4.4.1 Release 1
auto-merger: merge in from slim/kk4.4