ARM: OMAP1: Compile in other 16xx boards to OSK defconfig

This allows monitoring compile issues with Kautobuild for
other omap1 boards until we have more board specific defconfig
files.

After 2.6.25, we can add a generic config_omap_generic16xx to
compile in support for all 16xx boards and then remove other
boards from OSK defconfig.

Signed-off-by: Tony Lindgren <tony@atomide.com>