drm/rcar-du: Update plane pitch in .mode_set_base() operation

drm/rcar-du: Update plane pitch in .mode_set_base() operation

commit eb86301f293da3c362db729a9f40ddb25755902b upstream.

When setting a new frame buffer with the mode set base operation the
pitch value might change. Set the hardware plane pitch register at the
same time as the plane base address in the rcar_du_plane_update_base()
function to make sure the pitch value always matches the frame buffer.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>