OMAP3EVM: TWL4030 Keypad irq error fix

without this the below error messages were coming continuously

TWL4030 module irq 369 is disabled but can't be masked!
<2>TWL4030 module irq 369 is disabled but can't be masked!

Signed-off-by: Arun C <arunedarath@mistralsolutions.com>
Acked-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>