omap3 : Enable TWL4030 Keypad for Zoom2 and Zoom3 boards

The TWL4030 keypad driver is not enabled by default for zoom2 and zoom3
boards.

This patch will enable the same for both zoom2 and zoom3 boards.

Tested on zoom2(3430) and zoom3(3630) boards.

Signed-off-by: Manjunatha GK <manjugk@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>