media: ccs-pll: Check for too high VT PLL multiplier in dual PLL case

The check for VT PLL upper limit in dual PLL case was missing. Add it now.

Fixes: 6c7469e4 ("media: ccs-pll: Add trivial dual PLL support")
Cc: stable@vger.kernel.org
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>