"leds: Add openfirmware platform device support" breaks sparc

[Andrew Morton]

linux-next's dc0f6e94d7f487c624254597a0b86ef41c525673 (which I don't
seem to be able to find on any mailing lists to which I subscribe)
breaks the sparc64 allmodconfig build:

drivers/leds/leds-gpio.c: In function `gpio_led_init':
drivers/leds/leds-gpio.c:286: error: implicit declaration of function `of_register_platform_driver'
drivers/leds/leds-gpio.c: In function `gpio_led_exit':
drivers/leds/leds-gpio.c:302: error: implicit declaration of function `of_unregister_platform_driver'

afacit that interface is powerpc-only.