OMAP3: Zoom2: Enable Board and CPU info

With other OMAP3 boards we recently switched to CPU and Board
info API. From parallel merge, this is missing for Zoom2.
Enable it for Zoom2, too.

Signed-off-by: Dirk Behme <dirk.behme@googlemail.com>
Acked-by: Tom Rix <Tom.Rix@windriver.com>