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/drivers/lenovo/hybrid_graphics/romstage.c b/src/drivers/lenovo/hybrid_graphics/romstage.c
index 747c9b7..7cc1610 100644
--- a/src/drivers/lenovo/hybrid_graphics/romstage.c
+++ b/src/drivers/lenovo/hybrid_graphics/romstage.c
@@ -39,7 +39,7 @@
 		return;
 	}
 
-	mode = get_int_option("hybrid_graphics_mode", HYBRID_GRAPHICS_DEFAULT_GPU);
+	mode = get_uint_option("hybrid_graphics_mode", HYBRID_GRAPHICS_DEFAULT_GPU);
 
 	if (mode == HYBRID_GRAPHICS_DISCRETE) {
 		printk(BIOS_DEBUG, "Hybrid graphics:"