ARM: mach-shmobile: Kota2 GPIO LEDs support

This patch ties in GPIO LEDs support on the Kota2
board. For now all LEDs are driven by the GPIO LED
driver, but in the not so distant future the LEDs
hooked up to TPU pin functions will be moved over
to the recently posted LED TPU driver.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>