drm/i915: use octal permissions in display debugfs

Octal permissions are preferred over the symbolics ones.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231205134143.2427661-3-jani.nikula@intel.com

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

@@ -1096,7 +1096,7 @@ void intel_display_debugfs_register(struct drm_i915_private *i915)
 
 	for (i = 0; i < ARRAY_SIZE(intel_display_debugfs_files); i++) {
 		debugfs_create_file(intel_display_debugfs_files[i].name,
-				    S_IRUGO | S_IWUSR,
+				    0644,
 				    minor->debugfs_root,
 				    to_i915(minor->dev),
 				    intel_display_debugfs_files[i].fops);
@@ -1583,13 +1583,13 @@ void intel_connector_debugfs_add(struct intel_connector *connector)
 	intel_psr_connector_debugfs_add(connector);
 
 	if (connector_type == DRM_MODE_CONNECTOR_eDP)
-		debugfs_create_file("i915_panel_timings", S_IRUGO, root,
+		debugfs_create_file("i915_panel_timings", 0444, root,
 				    connector, &i915_panel_fops);
 
 	if (connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
 	    connector_type == DRM_MODE_CONNECTOR_HDMIA ||
 	    connector_type == DRM_MODE_CONNECTOR_HDMIB) {
-		debugfs_create_file("i915_hdcp_sink_capability", S_IRUGO, root,
+		debugfs_create_file("i915_hdcp_sink_capability", 0444, root,
 				    connector, &i915_hdcp_sink_capability_fops);
 	}