MIPS: qi_lb60: Enable the jz4740-wdt driver

The watchdog is an useful piece of hardware, so there's no reason not to
enable it.

Besides, this is important for restart to work after the change in the
next commit.

This commit enables the Kconfig option in the qi_lb60 defconfig.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Acked-by: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: Mathieu Malaterre <malat@debian.org>
Cc: linux-mips@linux-mips.org
Cc: linux-watchdog@vger.kernel.org
Signed-off-by: James Hogan <jhogan@kernel.org>