Add reset key as a platform device

Need CONFIG_KEYBOARD_GPIO [=y]
set reset key as a platform device,
keycode = 28(KEY_ENTER)
key can use for waking up the device.
Modify codes for gpio leds as platform device.

Correct gpio pin setting,
but still lack proper configuration in .config.
It seems need CONFIG_LEDS_GPIO_PLATFORM=y and CONFIG_LEDS_GPIO=y.
Add if CONFIG_LEDS_ , correct leds' active_low setting and change LD6 trigger to timer

Add if CCONFIG_LEDS_* to avoid compiling error when required CONFIG parameter is not selected.
Corredt leds' setting data .active_low to fit actual status.
Change LD6 Trigger from ineffective ide-disk trigeger to timer trigger.
Timer trigger is effective when delay_on and delay_off is set.
Merge branch 'master' of https://github.com/suzuke/kernel-pdk7105