console/post: Split parts to arch/

Both IO port and cmos are currently arch/x86 only features.

Change-Id: I010af3f645c0be38dd856657874c36103aebbdc2
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38187
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 arch_post_code(u8 value);
 void cmos_post_code(u8 value);
 #if CONFIG(CMOS_POST_EXTRA)
 void post_log_extra(u32 value);