MIPS: Loongson 2F: Add gpio/gpioilb support

Signed-off-by: Arnaud Patard <apatard@mandriva.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1163/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>