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/mainboard/getac/p470/early_init.c b/src/mainboard/getac/p470/early_init.c
index 1ca9b79..c28d602 100644
--- a/src/mainboard/getac/p470/early_init.c
+++ b/src/mainboard/getac/p470/early_init.c
@@ -35,7 +35,7 @@
 {
 	int lpt_en = 0;
 
-	if (get_int_option("lpt", 0))
+	if (get_uint_option("lpt", 0))
 		lpt_en = LPT_LPC_EN; /* enable LPT */
 
 	// decode range