ARM: dts: augment Moxa ART GPIO node

The Moxa ART GPIO is a Faraday FTGPIO010. Augment the DTS node
to indicate both compatible values for the SoC and the IP part.
Also increase the register range to 0x100, it has at least 0x48
bytes of registers, and a few extra will not hurt.

Tested-by: Jonas Jensen <jonas.jensen@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>