ARM: dts: switch timer config to common devkit8000 devicetree

This patch allow lcd43 and lcd70 flavors to benefit from timer
evolution.

Fixes: e428e250 ("ARM: dts: Configure system timers for omap3")
Signed-off-by: Anthoine Bourgeois <anthoine.bourgeois@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>