ARM: dts: cubox-i/hummingboard: Fix the license text

Arrange the license text a bit to make it clear.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>