twl4030 gpio platform data

Define platform data for configuring TWL4030 GPIOs,
and provide it for all boards using these chips.

For now all boards use the same fixed assignments for
GPIO and IRQ numbers.  Eventually we should be able
to shuffle them without changing platform headers.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>