This matches licensing used by other 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 Vivek.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Vivek Unune <npcomplete13@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>