ath9k_htc: Update firmware to version 1.3

v1.1:
* Revamp target capabilities.
* Fix WEP/TKIP.
* Fix BTCOEX.

v1.2:
* Remove TPC for UB94.
* Increase TX buffers count to 48 for UB94/95
* Fix TX power for beacon frames
* Add WMI_BITRATE_MASK_CMDID.
* Fix minimum rate selection for management frames.
* General code scrub.

v1.3:
* Remove unused PHY modes (TURBO etc.)
* Remove unused MIMO PS code.
* Cleanup node flags.
* Remove FastFrame code.
* Fix various bugs in management frame transmission.
* Fix duration calculation.
* Fix packet type calculation.
* Enable CAB queue for UB94/95.
* Fix sequence number assignment.
* Remove vendor-specific hacks.
* Add TX completion for multicast packets.
* Various code cleanups.
* Reduce credit size for UB94/95 to 45.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>