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/siemens/chili/romstage.c b/src/mainboard/siemens/chili/romstage.c
index 330d8afd..ddcc2cc 100644
--- a/src/mainboard/siemens/chili/romstage.c
+++ b/src/mainboard/siemens/chili/romstage.c
@@ -24,9 +24,9 @@
 	memupd->FspmConfig.EccSupport = 1;
 	memupd->FspmConfig.UserBd = BOARD_TYPE_MOBILE;
 
-	const uint8_t vtd = get_int_option("vtd", 1);
+	const uint8_t vtd = get_uint_option("vtd", 1);
 	memupd->FspmTestConfig.VtdDisable = !vtd;
-	const uint8_t ht = get_int_option("hyper_threading", memupd->FspmConfig.HyperThreading);
+	const uint8_t ht = get_uint_option("hyper_threading", memupd->FspmConfig.HyperThreading);
 	memupd->FspmConfig.HyperThreading = ht;
 
 	variant_romstage_params(memupd);