Adding ath6kl driver support to compat-wireless

Adding ath6kl driver support to compat-wireless

Adding the upstream version of the ath6kl driver into compat-wireless.

Change-Id: I69bc70afd9f683b1687d9b0dec8ea1b351970299
Signed-off-by: Vipin Mehta <vmehta@atheros.com>;

BUG=
TEST=The following tests were carried out on a testbed with x86 machines running ChromiumOS and an ARM platform running Ubuntu with a kernel identical to Chromium OS. Pls note that the test cycle was carried out on a build slightly older than this one.
- Security
- Scanning
- Roaming
- DFS
- Performance
- 11n Interoperability
- Stress
- 11n WiFi
- uAPSD
Some of the defects identified from the above tests were fixed in the driver/firmware and spot tested.

[vipinmehta, 2010-10-01 00:12:04]

The ath6kl driver is now upstream and can be found in the drivers/staging/ath6kl
directory in Stephen Rothwell's linux-next tree. It will get into Linus' tree
during the next merge window. The ath6kl support has also been added to the
upstream compat-wireless.

The patch adds the upstream ath6kl driver into compat-wireless as there were
issues with the driver when the compat-wireless was enabled. The issues were
related to incompatible cfg80211 headers between the wireless subsystem within
the kernel and compat-wireless. Adding ath6kl to the compat-wireless directory
such that it compiles against the modified headers provided in the
compat-wireless package fixes the problem.

The patch will end up creating 2 versions of the ath6kl driver one that works
with compat-wireless and the other which works when the compat-wireless is
disabled. The differences should be minimal though and related to the difference
in the data structures between the kernel and compat-wireless.

I'll also shortly generate a patch against the the other version on ath6kl in
the chromeos/drivers/ath6kl directory to bring it at par with the upstream
version. The firmware will still be common.