google/gru: Change Scarlet SKU ID pins to pull-ups

These pins need to be pull-ups. I forgot.

BUG=b:69373077

Change-Id: I9314617e01d35898254984529f269d4442e736f1
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/22775
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/gru/boardid.c

@@ -88,6 +88,7 @@ uint32_t sku_id(void)
 
 	gpio_t pins[3] = {[2] = GPIO(3, D, 6), [1] = GPIO(3, D, 5),
 			  [0] = GPIO(3, D, 4)}; /* GPIO3_D4 is LSB */
-	sku_id = gpio_base2_value(pins, ARRAY_SIZE(pins));
+
+	sku_id = gpio_pullup_base2_value(pins, ARRAY_SIZE(pins));
 	return sku_id;
 }