ARM: dts: omap4-panda-common: remove unneded unit names

This patch fixes the following DTC warnings for omap4-panda.dtb,
omap4-panda-a4.dtb and omap4-panda-es.dtb:

"encoder@0 has a unit name, but no reg property"
"endpoint@0 has a unit name, but no reg property"
"connector@0 has a unit name, but no reg property"
"encoder@1 has a unit name, but no reg property"
"connector@1 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>