drm/i915: Add more AUX CHs to the enum

We need to go up to AUX_CH_I (aka. AUX CH USBC6) these days.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200630215601.28557-2-ville.syrjala@linux.intel.comReviewed-by: José Roberto de Souza <jose.souza@intel.com>

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

@@ -280,6 +280,8 @@ enum aux_ch {
 	AUX_CH_E, /* ICL+ */
 	AUX_CH_F,
 	AUX_CH_G,
+	AUX_CH_H,
+	AUX_CH_I,
 };
 
 #define aux_ch_name(a) ((a) + 'A')