src: Replace remaining {get,set}_option() instances

With this change, the type-unsafe {get,set}_option() API functions are
no longer used directly. The old API gets dropped in a follow-up.

Change-Id: Id3f3e172c850d50a7d2f348b1c3736969c73837d
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52512
Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/intel/hyperthreading/intel_sibling.c

@@ -21,7 +21,7 @@ void intel_sibling_init(struct device *cpu)
 	/* On the bootstrap processor see if I want sibling cpus enabled */
 	if (first_time) {
 		first_time = 0;
-		get_option(&disable_siblings, "hyper_threading");
+		disable_siblings = get_int_option("hyper_threading", disable_siblings);
 	}
 	result = cpuid(1);
 	/* Is hyperthreading supported */