media: rockchip: rga: fix rga offset lookup

The arguments to rga_lookup_draw_pos() are passed in the wrong order,
rotate mode should be before mirror mode.

Fixes: 558c248f ("media: rockchip: rga: split src and dst buffer setup")
Cc: stable@vger.kernel.org
Signed-off-by: John Keeping <jkeeping@inmusicbrands.com>
Reviewed-by: Michael Tretter <m.tretter@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>