drm/i915/pch: replace BUG_ON() with drm_WARN_ON()

Avoid BUG_ON(). Replace with drm_WARN_ON().
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220830093411.1511040-3-jani.nikula@intel.com

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

@@ -654,7 +654,7 @@ static void ilk_init_pch_refclk(struct drm_i915_private *dev_priv)
 		}
 	}
 
-	BUG_ON(val != final);
+	drm_WARN_ON(&dev_priv->drm, val != final);
 }
 
 /*