drm/i915/bios: add i915 backpointer to intel_bios_encoder_data

We'll be needing it in the future.

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/026b737b122273d256f4247e9b0c84529aa391fd.1615998927.git.jani.nikula@intel.com

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

@@ -60,6 +60,8 @@
 
 /* Wrapper for VBT child device config */
 struct intel_bios_encoder_data {
+	struct drm_i915_private *i915;
+
 	struct child_device_config child;
 	struct dsc_compression_parameters_entry *dsc;
 	struct list_head node;
@@ -2026,6 +2028,8 @@ parse_general_definitions(struct drm_i915_private *i915,
 		if (!devdata)
 			break;
 
+		devdata->i915 = i915;
+
 		/*
 		 * Copy as much as we know (sizeof) and is available
 		 * (child_dev_size) of the child device config. Accessing the
@@ -2103,6 +2107,7 @@ init_vbt_missing_defaults(struct drm_i915_private *i915)
 		if (!devdata)
 			break;
 
+		devdata->i915 = i915;
 		child = &devdata->child;
 
 		if (port == PORT_F)