Camera: move CAMERA_CMD_METADATA_* outside of QCOM_HARDWARE

Change-Id: I2374419f2939ca737fd0a887b552f3e5a9bcd349
Camera: Add meta data types for meta data callback
and auto HDR Metadata type

- This type is used during auto HDR
  Metadata callbacks.

Conflicts:
	include/system/camera.h

Change-Id: Ifd6fd88c9345d12af8406e59ed209cb91677b9c1