drm/i915/bios: Add the "Disable compression for the Display Port/HDMI external display" bit

The child device block has gained a new bit for disabling
compression for external displays. Seems stupid, but there it is.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907093534.29004-2-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -418,7 +418,8 @@ struct child_device_config {
 			u8 compression_method_cps:1;		/* 198+ */
 			u8 ganged_edp:1;			/* 202+ */
 			u8 lttpr_non_transparent:1;		/* 235+ */
-			u8 reserved2:3;
+			u8 disable_compression_for_ext_disp:1;	/* 251+ */
+			u8 reserved2:2;
 			u8 compression_structure_index:4;	/* 198+ */
 			u8 reserved3:4;
 			u8 hdmi_max_frl_rate:4;			/* 237+ */