console/post: Move cmos_post_code() under pc80/rtc

We should keep console/ somewhat arch-agnostic.

Change-Id: I4465888023ba5ae0706b5e98e541c40f975d11e3
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38186
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/console/console.h

@@ -29,6 +29,7 @@
 #include <console/vtxprintf.h>
 
 void post_code(u8 value);
+void cmos_post_code(u8 value);
 #if CONFIG(CMOS_POST_EXTRA)
 void post_log_extra(u32 value);
 struct device;