linux-firmware: ath9k_htc - use newer firmware

linux-firmware: ath9k_htc - use newer firmware

Existing blobs are of version ath9k-htc 1.3.1, see
http://git.kernel.org/cgit/linux/kernel/git/firmware/linux-firmware.git/commit/?id=21a6c3e55df956dd223279627685778268ede70f

These are as said in the commit are left for compatibility with older
kernels which [older kernels] will look for blobs in the
root of "/lib/firmware".

But there're newer v1.4 blobs in ath9k_htc folder.
And newer kernels (>=4.4) look first in that new location
"/lib/firmware/ath9k_htc".

Note that even new kernels will fall back to previous location
if new one doesn't exist.

Tested with TP-LINK TL-WN722N (has Atheros AR9271 inside).

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: John Keeping <john@metanate.com>
Cc: Matt Weber <matt@thewebers.ws>
Cc: Alex Suykov <alex.suykov@gmail.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Acked-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>