drivers/pc80/rtc: Move sanitize_cmos()

Implementation depends on USE_OPTION_TABLE.

Change-Id: If7f8f478db3214842b6cc60cd77b4ea81cab6e3a
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38195
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/option.h

@@ -16,6 +16,8 @@
 
 #include <types.h>
 
+void sanitize_cmos(void);
+
 enum cb_err cmos_set_option(const char *name, void *val);
 enum cb_err cmos_get_option(void *dest, const char *name);