[CFT] hostap mode fixes with ath(4)

[timp]

This night I updated my atom-based home router from "FreeBSD 8.2 RELEASE
amd64" to 10-CURRENT for testing your ath(4) changes.

I use noname chinese card from ebay (Atheros AR5008 802.11n Wireless Mini
PCI-E Card 300Mbps)
# pciconf -lv
ath0 at pci0:2:0:0:        class=0x028000 card=0x102610e9 chip=0x0024168c
rev=0x01 hdr=0x00
    vendor     = 'Atheros Communications Inc.'
    device     = 'AR5008 Wireless Network Adapter'
    class      = network
# dmesg -a | grep ath
ath0: <Atheros 5416> mem 0xf0200000-0xf020ffff irq 17 at device 0.0 on pci2
ath0: AR5418 mac 12.10 RF5133 phy 8.1
And I use hostapd with wpa-psk

Before this update sometimes (every 2-3 hours) I got storm with messages
like
ath0: hardware error; resetting
and others.
My router couldn't work.
Restart router helped, but for short time.

I found a solution: set wlan0 to most unoccupied channel.

Now I don't set channel and it works very well!

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