Camera: Add meta data types for meta data callback

Add meta data callback types in order to reuse same callback
path for diffrent data types.

Change-Id: I9892771c11eda0bd15a2330ba98f70b02490c802
Camera: Adds auto HDR Metadata type

- This type is used during auto HDR
  Metadata callbacks.

Change-Id: Ifd6fd88c9345d12af8406e59ed209cb91677b9c1
Camera: move CAMERA_CMD_METADATA_* outside of QCOM_HARDWARE

Change-Id: I2374419f2939ca737fd0a887b552f3e5a9bcd349
Merge remote-tracking branch 'omni/android-4.4' into android-4.4