x86/smm: don't hide harmless declarations

Hiding them requires #if CONFIG_HAVE_SMI_HANDLER instead of
if (IS_ENABLED(CONFIG_HAVE_SMI_HANDLER))

Change-Id: Ib874cd98e195ad7437d05be1696004b29bf97a66
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: https://review.coreboot.org/12565
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed