ARM: dts: dm3730-torpedo-devkit: remove unneeded unit names

This patch fixes the following DTC warnings:

"dmtimer-pwm@10 has a unit name, but no reg property"
"display@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>