The !defined(MODULE) conditional has been added to the
OF_EARLYCON_DECLARE() define.

This commit partially reverts commit 3f5921a6 ("serial:
8250/mediatek: fix building with SERIAL_8250=m").
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: NMatthias Brugger <matthias.bgg@gmail.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>