OMAP3:Beagle: Enable mtdparts

http://www.denx.de/wiki/DULG/UBootCmdGroupFlash#UBootCmdFlMtdparts


provides a flexible way to create and maintain u-boot mtd
partitions. This allows commands such as "nand erase fs"
to work and the user no longer needs to decode the absolute
nand offsets. This patch enables this function for beagleboard

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>