drm/mgag200: Use drm_connector_helper_get_modes()

Mgag200's .get_modes() function is identical to the common helper.
Use the latter.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240513125620.6337-11-tzimmermann@suse.de

drivers/gpu/drm/mgag200/mgag200_drv.h

@@ -420,10 +420,8 @@ void mgag200_crtc_atomic_destroy_state(struct drm_crtc *crtc, struct drm_crtc_st
 #define MGAG200_DAC_ENCODER_FUNCS \
 	.destroy = drm_encoder_cleanup
 
-int mgag200_vga_connector_helper_get_modes(struct drm_connector *connector);
-
 #define MGAG200_VGA_CONNECTOR_HELPER_FUNCS \
-	.get_modes  = mgag200_vga_connector_helper_get_modes
+	.get_modes = drm_connector_helper_get_modes
 
 #define MGAG200_VGA_CONNECTOR_FUNCS \
 	.reset                  = drm_atomic_helper_connector_reset, \

drivers/gpu/drm/mgag200/mgag200_mode.c

@@ -737,23 +737,6 @@ void mgag200_crtc_atomic_destroy_state(struct drm_crtc *crtc, struct drm_crtc_st
 	kfree(mgag200_crtc_state);
 }
 
-/*
- * Connector
- */
-
-int mgag200_vga_connector_helper_get_modes(struct drm_connector *connector)
-{
-	const struct drm_edid *drm_edid;
-	int count;
-
-	drm_edid = drm_edid_read(connector);
-	drm_edid_connector_update(connector, drm_edid);
-	count = drm_edid_connector_add_modes(connector);
-	drm_edid_free(drm_edid);
-
-	return count;
-}
-
 /*
  * Mode config
  */