usbdebug: Refactor init calls

Expose the function that can unconditionally re-initialise
EHCI debug host and gadget.

Given the missing header in soc/intel files that prevented
building with USBDEBUG_IN_ROMSTAGE=y, it is not actually
known if those SOCs work at all for usbdebug.

Change-Id: I8ae7e144a89a8f7e5f9d307ba4e73d4f96401a79
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/30557
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/northbridge/intel/sandybridge/raminit_mrc.c b/src/northbridge/intel/sandybridge/raminit_mrc.c
index 1975051..44a1f3e 100644
--- a/src/northbridge/intel/sandybridge/raminit_mrc.c
+++ b/src/northbridge/intel/sandybridge/raminit_mrc.c
@@ -238,10 +238,9 @@
 		die("UEFI PEI System Agent not found.\n");
 	}
 
-#if IS_ENABLED(CONFIG_USBDEBUG_IN_ROMSTAGE)
 	/* mrc.bin reconfigures USB, so reinit it to have debug */
-	usbdebug_init();
-#endif
+	if (IS_ENABLED(CONFIG_USBDEBUG_IN_ROMSTAGE))
+		usbdebug_hw_init(true);
 
 	/* For reference print the System Agent version
 	 * after executing the UEFI PEI stage.