ath(4): Remove MIPS SoC build glue and AR9130 from FreeBSD HAL

All of these are obsoleted by the general removal of MIPS support.

Actually, corresponding to the removed AH_SUPPORT_x, there is more
superfluous support sprinkled across the HAL source. However, that
code is left in place for now in order to ease a sync to NetBSD.

Reviewed by: emaste (w/ man page fix)
Approved by: adrian
Differential Revision: https://reviews.freebsd.org/D41355

[ath_hal] migrate the bluetooth definitions out from ah.h / ar9300_freebsd_inc.h.

The eventual MCI driver side of things needs the MCI bits to live
in the HAL API so we can get to them.

Tested:

* QCA9565, STA mode + bluetooth

Add initial ar9300 HAL support for the spectral scan mode.

Adjust a comment; we now support these embedded boards!

Add initial support for the QCA953x SoC (honeybee) wifi.

This is a 2x2 2GHz 802.11n part. It works enough at the moment to
bring up, scan and associate. I haven't started using this as
a day to day AP.

The specifics:

* add honeybee initvals
* add in changes; a mix from the QCA HAL and ath9k;
* fix a bug in AR_SREV_AR9580_10_OR_LATER(), which is only used
for one capability check and we don't even implement it - so it's
a big no-op.

Shady things:

* ath9k has the "platform data" define the 25/40MHz clock.
This HAL .. doesn't. Honeybee gets hard-coded to 25MHz which
it likely shouldn't be. I'll have to go and identify/fix those.

Tested:

* Qualcomm Atheros AP143 reference design board.

Obtained from: Qualcomm Atheros; Linux ath9k

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

Glue to suck in the QCA9550 HAL support if AH_SUPPORT_QCA9550 is defined.

In preparation to support AR933x SoC builds, allow the AH_SUPPORT_AR93(xx)
options to set the AR9300 HAL defines.

This enables the Wasp, Hornet (and later Scorpion) SoC code.

Flip on AH_PRIVATE_DIAG by default; this will include the AR9300 EEPROM
dump code that is worth having around.

Bring over my FreeBSD modifications for the AR9300 HAL to make it
work in FreeBSD.

This is still heavily a work in progress but I'd rather it start
shipping in -HEAD sooner rather than later.

This doesn't (yet) link it into the build system either for a static
kernel or as a module; that will come later (after many, many make universe
tests.)