ARM: dts: BCM53573: Relicense SoC file to the GPL 2.0+ / MIT

This matches licensing used by most of BCM5301X files and is preferred as:
1) GPL 2.0+ makes it clearly compatible with Linux kernel
2) MIT is also permissive but preferred over ISC

This file has been developed by me & once modified by Rob dropping a
single leading zero in an UART address.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>