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/winbond/w83667hg-a/superio.c b/src/superio/winbond/w83667hg-a/superio.c
index 5f9683299..0a06898 100644
--- a/src/superio/winbond/w83667hg-a/superio.c
+++ b/src/superio/winbond/w83667hg-a/superio.c
@@ -47,7 +47,7 @@
 		break;
 	case W83667HG_A_ACPI:
 		/* Set power state after power fail */
-		power_status = get_int_option("power_on_after_fail",
+		power_status = get_uint_option("power_on_after_fail",
 				CONFIG_MAINBOARD_POWER_FAILURE_STATE);
 		pnp_enter_conf_mode(dev);
 		pnp_set_logical_device(dev);