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/southbridge/intel/lynxpoint/smihandler.c b/src/southbridge/intel/lynxpoint/smihandler.c
index 2c89a95..769cacb 100644
--- a/src/southbridge/intel/lynxpoint/smihandler.c
+++ b/src/southbridge/intel/lynxpoint/smihandler.c
@@ -82,7 +82,7 @@
 	u8 tmp70, tmp72;
 	tmp70 = inb(0x70);
 	tmp72 = inb(0x72);
-	const int s5pwr = get_int_option("power_on_after_fail",
+	const unsigned int s5pwr = get_uint_option("power_on_after_fail",
 					 CONFIG_MAINBOARD_POWER_FAILURE_STATE);
 	outb(tmp70, 0x70);
 	outb(tmp72, 0x72);