1. Change mpp_device into a new layer for kernel drvier.
2. Separate mpp_service driver and vcodec_service driver.
3. Add mpp_service.c for /dev/mpp_service driver support.
4. Add global mpp_service info query interface.
5. Remove unused function in mpp_device.c
Change-Id: I3f53bba3aef525ad3b1f450bb55830d1eeaf29a6
Signed-off-by: Herman Chen <herman.chen@rock-chips.com>