[ath_hal] use the correct revision information for QCA953x.

This probe/attaches correctly in my local branch and now displays
a useful message:

ath0: <Qualcomm Atheros QCA953x> at mem 0x18100000-0x1811ffff irq 0 on nexus0
...
ath0: AR9530 mac 1280.0 RF5110 phy 0.0