Update the hardware LED blinking code to do something useful rather than relying on what the register defaults are.
Update the hardware LED blinking code to do something useful rather than
relying on what the register defaults are.

This forces the blink mode to be proportional to the TX and RX frames
which match the RX filter.

This (along with a few tweaks to if_ath_led.c to configure the correct
GPIO pins) allows my DWA-552 AR5416 NIC to blink the LEDs in a useful
fashion, however those LEDs are marked "Link" and "Act(ivity)", which
don't really map well to the "power" / "network" LED interface which
the MAC provides. Some further tinkering is needed to see what other
useful operating modes are possible.

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