[ath] ensure the right methods / options get overridden for MCI bluetooth coex

It turns out that the srev checks can't be done in the early attach
in ar9300_freebsd.c, because the poweron and srev check hasn't yet
happened.

So:

• Re-add the MCI overrides in attach
• Add QCA9565 (Aphrodite) check for the LNA diversity stuff.

Tested:

• QCA9565, STA mode + bluetooth