ath6kl: Bringing in the upstream version

ath6kl: Bringing in the upstream version

The patch brings in the changes from the version of the ath6kl driver
that is now upstream.

Change-Id: I661469514bfedf98c20ab3ef48cbfbf90534d4c0
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 20:09:07]

The patch brings in changes from the upstream version of the ath6kl driver. The
summary of changes is:
- Moving the header files that are common to the host and target side code to
ath6kl/include/common directory.
- Changing of license text to ISC.
- Bug fixes