drm/i915/bmg: BMG should re-use MTL's south display logic

Battlemage's south display is the same as Meteor Lake's, including the
need to invert the HPD pins, which Lunar Lake does not need.
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Reviewed-by: Dnyaneshwar Bhadane <dnyaneshwar.bhadane@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240430172850.1881525-14-radhakrishna.sripada@intel.com

drivers/gpu/drm/i915/soc/intel_pch.c

@@ -218,10 +218,10 @@ void intel_detect_pch(struct drm_i915_private *dev_priv)
 	if (DISPLAY_VER(dev_priv) >= 20) {
 		dev_priv->pch_type = PCH_LNL;
 		return;
-	} else if (IS_METEORLAKE(dev_priv)) {
+	} else if (IS_BATTLEMAGE(dev_priv) || IS_METEORLAKE(dev_priv)) {
 		/*
 		 * Both north display and south display are on the SoC die.
-		 * The real PCH is uninvolved in display.
+		 * The real PCH (if it even exists) is uninvolved in display.
 		 */
 		dev_priv->pch_type = PCH_MTL;
 		return;