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>

src/include/console/usb.h

@@ -21,6 +21,7 @@
 #include <stdint.h>
 
 void usbdebug_init(void);
+int usbdebug_hw_init(bool force);
 
 void usb_tx_byte(int idx, unsigned char data);
 void usb_tx_flush(int idx);