camera: wrap fast AF enums around ifdef flags & drop camera 2.0 hal

Change-Id: I2323b7dbda4096b2cce30f618cbb826a3442716f

Conflicts:

	QCamera/HAL2/core/inc/QCamera_Intf.h
	QCamera/HAL2/core/src/QCameraHAL.cpp
	QCamera/HAL2/core/src/QCameraHWI_Metatags.cpp
	QCameraHWI.cpp
16 files changed