ARM: dts: omap3-ha-lcd: remove unneeded unit name

This patch fixes the following DTC warnings for omap3-ha-lcd.dtb:

"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>