src: Retype option API to use unsigned integers

The CMOS option system does not support negative integers. Thus, retype
and rename the option API functions to reflect this.

Change-Id: Id3480e5cfc0ec90674def7ef0919e0b7ac5b19b3
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52672
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
diff --git a/src/superio/ite/it8720f/superio.c b/src/superio/ite/it8720f/superio.c
index 0ecbddc..c63fa9a 100644
--- a/src/superio/ite/it8720f/superio.c
+++ b/src/superio/ite/it8720f/superio.c
@@ -17,7 +17,7 @@
 
 static void power_control_init(struct device *dev)
 {
-	int power_on = get_int_option("power_on_after_fail", MAINBOARD_POWER_OFF);
+	unsigned int power_on = get_uint_option("power_on_after_fail", MAINBOARD_POWER_OFF);
 	u8 value;
 
 	pnp_enter_conf_mode(dev);