ARM: OMAP: omap2plus_defconfig: Enable ehci-omap and sms95xx support

Boards like beagle and panda use ehci based smsc95xx lan chips
one has to manually enable these supports to get nfs working
on these boards. So keep these support enable by default.

Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>