drm/i915/lnl: Extend C10/C20 phy

For Lunar Lake, DDI-A is connected to C10 PHY, while TC1-TC3 are connected
to C20 phy, like in Meteor Lake. Update the check in intel_is_c10phy()
accordingly.

This reverts the change in commit e388ae97 ("drm/i915/display:
Eliminate IS_METEORLAKE checks") that turned that into a display engine
version check. The phy <-> port connection is very SoC-specific and not
related to that version.

IS_LUNARLAKE() is defined to 0 in i915 as it's expected that the
(upcoming) xe driver is the one defining the platform, with i915 only
driving the display side.

Bspec: 70818
Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231026184045.1015655-2-lucas.demarchi@intel.com

drivers/gpu/drm/i915/display/intel_cx0_phy.c

@@ -31,7 +31,7 @@
 
 bool intel_is_c10phy(struct drm_i915_private *i915, enum phy phy)
 {
-	if (DISPLAY_VER_FULL(i915) == IP_VER(14, 0) && phy < PHY_C)
+	if ((IS_LUNARLAKE(i915) || IS_METEORLAKE(i915)) && phy < PHY_C)
 		return true;
 
 	return false;

drivers/gpu/drm/i915/i915_drv.h

@@ -560,6 +560,7 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define IS_DG2(i915)	IS_PLATFORM(i915, INTEL_DG2)
 #define IS_PONTEVECCHIO(i915) IS_PLATFORM(i915, INTEL_PONTEVECCHIO)
 #define IS_METEORLAKE(i915) IS_PLATFORM(i915, INTEL_METEORLAKE)
+#define IS_LUNARLAKE(i915) 0
 
 #define IS_DG2_G10(i915) \
 	IS_SUBPLATFORM(i915, INTEL_DG2, INTEL_SUBPLATFORM_G10)