drm/i915/cdclk: Squash waveform is 16 bits

Have cdclk_squash_waveform() return a u16 since that's
how many bits we have in the waveform. We alreday use
u16 everywhere else.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240207013334.29606-3-ville.syrjala@linux.intel.comReviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>

drivers/gpu/drm/i915/display/intel_cdclk.c

@@ -1778,7 +1778,7 @@ static u32 bxt_cdclk_cd2x_div_sel(struct drm_i915_private *dev_priv,
 	}
 }
 
-static u32 cdclk_squash_waveform(struct drm_i915_private *dev_priv,
+static u16 cdclk_squash_waveform(struct drm_i915_private *dev_priv,
 				 int cdclk)
 {
 	const struct intel_cdclk_vals *table = dev_priv->display.cdclk.table;