MIPI DSI works on ports A and C, which map to pipes A and B,
respectively. Things are going to get more complicated with the
introduction of dual link DSI support, so clean up the register defines
and code to match reality.
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Reviewed-by: NGaurav K Singh <gaurav.k.singh@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>