serial: 8250_uniphier: drop !defined(MODULE) conditional

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

Now we can revert commit a2d3ea2f ("serial: 8250/uniphier:
fix modular build").

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>