dts/ls2080a: Remove text about writing to Free Software Foundation

Checkpatch complains about the text suggesting writing to
Free Software Foundation for GPLv2 license copy.

This patch removes the same from the .dtsi and .dts

Signed-off-by: Bhupesh Sharma <bhupesh.sharma@freescale.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>