mb/starlabs/starbook/mtl: Add missing config for GPP_E09

This pad isn't used, so set it to not connected.

Change-Id: Ic7174457f56e64751718dc10227ec07b793559eb
Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86988
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/starlabs/starbook/variants/mtl/gpio.c

@@ -207,6 +207,7 @@ const struct pad_config gpio_table[] = {
 	/* E08:					*/
 	PAD_NC(GPP_E08, NONE),
 	/* E09:	USB2_OC0			*/
+	PAD_NC(GPP_E09, NONE),
 	/* E10:					*/
 	PAD_NC(GPP_E10, NONE),
 	/* E11:					*/