C-PHY doesn't use a clock lane, hence the test for the clock lane when
there isn't one is faulty. Rework the test for the conflicting clock lane.
Signed-off-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>