Rename the function argument to 'adjusted_mode' whenever the function
only ever gets passed the adjusted_mode.

v2: Update due to intel_dsi.c changes
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NMika Kahola <mika.kahola@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>