ARM: mach-shmobile: AP4EVB: use gpio-leds for leds.

This allows control of the leds on the AP4EVB board by kernel events (triggers)
like mmc0/mmc1. In userland, the leds won't be available anymore over
/sys/class/gpio but via /sys/class/leds.

Signed-off-by: Arnd Hannemann <arnd@arndnet.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>