Created new omap3_alphaone config header

Had to decide whether to base off of beagle or overo (the two boards
that I'm familiar with). The overo is more more trimmed down, but the
beagle looks to be more actively maintained. Went with beagle.

Signed-off-by: Mike Lewis <mikelewis@alphalem.com>
omap3_alphaone: Renamed BEAGLE to ALPHAONE

Also added cmd line editing

Signed-off-by: Mike Lewis <mikelewis@alphalem.com>
omap3_alphaone: removed USB EHCI

I believe this applies to the USB Hub on the beagle, which the alphaone
does not have. (uses the TPS65950 for USB.

Signed-off-by: Mike Lewis <mikelewis@alphalem.com>