Staging: add otus Atheros wireless network driver

Initial dump of the otus USB wireless network driver.
It builds properly, but a lot of work needs to be done cleaning
it up before it can be merged into the wireless driver tree.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>