fsp/gop: Add running the GOP to the choice of gfx init

The new config choice is called RUN_FSP_GOP. Some things had to happen
on the road:

  * Drop confusing config GOP_SUPPORT,
  * Add HAVE_FSP_GOP to chipsets that support it,
  * Make running the GOP an option for FSP2.0 by returning 0
    in random VBT getters.

Change-Id: I92f88424004a4c0abf1f39cc02e2a146bddbcedf
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/19815
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/common/vbt.c

@@ -47,6 +47,9 @@ void *vbt_get(struct region_device *rdev)
 {
 	void *vbt_data;
 
+	if (!IS_ENABLED(CONFIG_RUN_FSP_GOP))
+		return NULL;
+
 	/* Normal mode and S3 resume path PEIM GFX init is not needed.
 	 * Passing NULL as VBT will not make PEIM GFX to execute. */
 	if (acpi_is_wakeup_s3())