ath6kl: add support for AR6003 v2.1.1

This adds support for AR6003 v2.1.1. Highlights changes
for this new hardware are:

1. Host interest area, through which driver communicates
   with FW has been enhanced to accomodate additional
   members for proper functioanlity of new HW.

2. The firmware and the board data files are different
   for AR6003 v2.1.1. The capability to read those file
   have been added in the driver.

3. Certain parameters like numdevice, firmware mode needs to be
   programmed for proper functionality of new driver.

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