gpio_keys, twl4030-pwrbutton: stay awake for 1sec on resume

This gives the userspace a chance to fully handle the pm_wakeup_event,
before autosleep suspends the system alltogether again.

This fixes suspend/resume on the OpenPhoenux GTA04, in combination with
the Replicant 4.2.2 userspace, which needs to execute this to stay
awake: 'echo on > /sys/power/state'

Signed-off-by: Lukas Märdian <lukas@goldelico.com>