Export the pitch for NV12 image
Export the pitch for NV12 image

This is required by some user-space applications.

Change-Id: If41bb36d51f2b76af080209d9f2c11c1256e10d9
Signed-off-by: Zhao Yakui <21bae65ecea50a19bd9d0fef489914760189fd5b@intel.com>

BtbN/intel-hybrid-driver,seanvk/intel-hybrid-driver,01org/intel-hybrid-driver,gbeauchesne/libva-intel-hybrid-driver,seanvk/intel-hybrid-driver,01org/intel-hybrid-driver,gbeauchesne/libva-intel-hybrid-driver,gbeauchesne/libva-intel-hybrid-driver,BtbN/intel-hybrid-driver,gbeauchesne/libva-intel-hybrid-driver,seanvk/intel-hybrid-driver,gbeauchesne/libva-intel-hybrid-driver,BtbN/intel-hybrid-driver,01org/intel-hybrid-driver,BtbN/intel-hybrid-driver,BtbN/intel-hybrid-driver,seanvk/intel-hybrid-driver,01org/intel-hybrid-driver,seanvk/intel-hybrid-driver,01org/intel-hybrid-driver