sandybridge: reinitialize usbdebug after MRC

MRC messes with USB devices, so we have to reinitialize
USB debug after MRC has finished.

Change-Id: I45c0a687cebd69d0a31235bb870f8c455f42d4f2
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Reviewed-on: http://review.coreboot.org/1377
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

src/northbridge/intel/sandybridge/raminit.c

@@ -265,6 +265,11 @@ void sdram_initialize(struct pei_data *pei_data)
 		die("UEFI PEI System Agent not found.\n");
 	}
 
+#if CONFIG_USBDEBUG
+	/* mrc.bin reconfigures USB, so reinit it to have debug */
+	early_usbdebug_init();
+#endif
+
 	/* For reference print the System Agent version
 	 * after executing the UEFI PEI stage.
 	 */