Initial commit from GPL source code

Initial commit from GPL source code

The code of the WAVE300 driver obtained from GPL sources of Arcadyan
HomeBox 2 6441:

https://github.com/christianheyl/HomeBox6441/blob/master/dl/lq-wave-300-03.04.02.00.42.7226abd10036.gpl.wls.src.tar.bz2

The license (dual BSD/GPL):

http://www.astorianetworks.com/astoria/source/Arcadyan%20HomeBox%206441%20EULA%20&%20GPL%20announcement.pdf

The discussion thread at openwrt:

https://forum.openwrt.org/t/support-for-wave-300-wi-fi-chip/24690

Alternatively the older version in GPL sources of D-link DWR-966:

https://github.com/brunompena/dwr-966/tree/master/dlhttps://github.com/brunompena/dwr-966/blob/master/dl/lq-wave-300-03.04.02.00.25.c9c85872fd07.gpl.wls.src.tar.bz2

(the difference is just the addition of few new functions, which are most
likely used only in WAVE400+ devices)

Signed-off-by: Petr Cvek <petrcvekcz@gmail.com>