Update ath6kl-compat support & fix AP mode

The ath6kl driver now works on the 2.6.35 kernel. Update the build
parameters to account for the changes in ath6kl-compat repository.

Also ensure that AP interface name is correct when using this driver.

Change-Id: If1aceb1f48ca2309e7c179dc9a446fc310e83a72