drm/i915: Remove pointless dpll_funcs checks

All platforms have dpll_funcs. Remove the pointless NULL checks.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220325123205.22140-4-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -6958,14 +6958,10 @@ intel_crtc_update_active_timings(const struct intel_crtc_state *crtc_state)
 
 static void intel_modeset_clear_plls(struct intel_atomic_state *state)
 {
-	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
 	struct intel_crtc_state *new_crtc_state;
 	struct intel_crtc *crtc;
 	int i;
 
-	if (!dev_priv->dpll_funcs)
-		return;
-
 	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
 		if (!intel_crtc_needs_modeset(new_crtc_state))
 			continue;