[ARM] pxa/MioA701: remove KConfig leds driver requirement

Since mioa701 board has migrated to the mfp architecture,
low power gpio setup is now correctly handled even when gpio
led driver is not loaded, and leds and vibrator don't stay
activated in suspend mode (especially vibrator).

Remove the not needed anymore dependency.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Eric Miao <eric.miao@marvell.com>