iw: add vendor send command
iw: add vendor send command

This allow to send vendor data to the driver.
This command required OUI and SUBCMD parameters.

Also optional DATA parameter could be used:

cat data.bin | iw wlan0 send oui subcmd -
iw wlan0 send oui subcmd file.bin
iw wlan0 vendor send oui subcmd 0x00 0x00 0x00 0x1f
echo EOF | iw wlan0 vendor send oui subcmd -

Signed-off-by: Janusz Dziedzic <a4201e08a607951e17dcd5a575c0fe6bceb34e87@tieto.com>
Signed-off-by: Johannes Berg <bff32994ff0f8d048f262a8388145a71b6071bfe@intel.com>

bw-oss/iw,greearb/iw-ct,bw-oss/iw,greearb/iw-ct,CTU-IIG/802.11p-iw,CTU-IIG/802.11p-iw