mb/google/geralt: add usb host support

Add usb host function support.

TEST=read usb data successfully.
BUG=b:236331724

Signed-off-by: Shaocheng Wang <shaocheng.wang@mediatek.corp-partner.google.com>
Change-Id: I52174306eb0c87c6e5a3665051099b5c0e8f45a0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65755
Reviewed-by: Yidi Lin <yidilin@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/geralt/mainboard.c

@@ -1,10 +1,11 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <device/device.h>
+#include <soc/usb.h>
 
 static void mainboard_init(struct device *dev)
 {
-	/* TODO: add mainboard init */
+	setup_usb_host();
 }
 
 static void mainboard_enable(struct device *dev)