ARM: dts: Freescale: re-license device tree files under GPLv2+/X11

ARM: dts: Freescale: re-license device tree files under GPLv2+/X11

The current GPL only licensing on the device trees makes it very
impractical for other software components licensed under another
license.

To make it easier to reuse them, re-license the the device trees for
Freescale (now NXP) SoCs and boards under GPLv2+/X11 dual license.

Same trend is followed in linux.

Cc: Priyanka Jain <[email protected]>
Cc: Mingkai Hu <[email protected]>
Cc: York Sun <[email protected]>
Signed-off-by: Pankaj Bansal <[email protected]>
Reviewed-by: York Sun <[email protected]>