usbdebug: Add option to disable console for romstage

If there is trouble setting up usbdebug, it may be useful to delay
usbdebug init to run in ramstage.

Change-Id: I31de5a06d3f9ce19f71c422cce0c8cb0fd50f396
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/4488
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/northbridge/intel/sandybridge/raminit.c

@@ -276,7 +276,7 @@ void sdram_initialize(struct pei_data *pei_data)
 		die("UEFI PEI System Agent not found.\n");
 	}
 
-#if CONFIG_USBDEBUG
+#if CONFIG_USBDEBUG_IN_ROMSTAGE
 	/* mrc.bin reconfigures USB, so reinit it to have debug */
 	usbdebug_init();
 #endif