drm/i915: Replace a memset() with zero initialization

Declaring a struct and immediately zeroing it with memset()
seems a bit silly to me. Just zero initialize the struct
when declaring it.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231124082735.25470-2-ville.syrjala@linux.intel.comReviewed-by: Mika Kahola <mika.kahola@intel.com>

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

@@ -4465,12 +4465,10 @@ verify_single_dpll_state(struct drm_i915_private *i915,
 			 struct intel_crtc *crtc,
 			 const struct intel_crtc_state *new_crtc_state)
 {
-	struct intel_dpll_hw_state dpll_hw_state;
+	struct intel_dpll_hw_state dpll_hw_state = {};
 	u8 pipe_mask;
 	bool active;
 
-	memset(&dpll_hw_state, 0, sizeof(dpll_hw_state));
-
 	drm_dbg_kms(&i915->drm, "%s\n", pll->info->name);
 
 	active = intel_dpll_get_hw_state(i915, pll, &dpll_hw_state);