Update the AR9300 HAL to the latest public available HAL from QCA.

I've been sitting on this for a year or so now; I've finally
tested it on enough devices to be reasonably sure it won't
cause too much drama. But, if you see issues, please email me.

Tested (all STA mode):

PCIe:

• AR9380
• AR9390
• AR9580
• AR9462
• AR9485

SoC:

• QCA9550
• AR9331
• AR9342