ARM: dts: colibri: use valid range configuration for weim

A valid WEIM range configuration must specify range entries for
all four chip selects. This fixes an error on boot:
  imx-weim: probe of 21b8000.weim failed with error -22

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>