ARM: dts: omap4-var-om44customboard: remove unneded unit name

This patch fixes the following DTC warnings for omap4-var-dvk-om44.dtb
and omap4-var-stk-om44.dtb:

"connector@0 has a unit name, but no reg property"

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>