ath5k: add PCI id

This device works fine of ath5k.

Details bellow
05:00.0 0200: 168c:ff1b (rev 01)
05:00.0 Ethernet controller: Atheros Communications Inc. Device ff1b (rev 01)
	Flags: bus master, fast devsel, latency 0, IRQ 19
	Memory at febf0000 (64-bit, non-prefetchable) [size=64K]
	Capabilities: <access denied>
	Kernel driver in use: ath5k

ath5k 0000:05:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
ath5k 0000:05:00.0: setting latency timer to 64
ath5k 0000:05:00.0: registered as 'phy0'
ath: EEPROM regdomain: 0x67
ath: EEPROM indicates we should expect a direct regpair map
ath: Country alpha2 being used: 00
ath: Regpair used: 0x67
ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
ath5k phy0: Atheros AR2425 chip found (MAC: 0xe2, PHY: 0x70)
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath5k/pci.c

@@ -47,6 +47,7 @@ static DEFINE_PCI_DEVICE_TABLE(ath5k_pci_id_table) = {
 	{ PCI_VDEVICE(ATHEROS, 0x001b) }, /* 5413 Eagle */
 	{ PCI_VDEVICE(ATHEROS, 0x001c) }, /* PCI-E cards */
 	{ PCI_VDEVICE(ATHEROS, 0x001d) }, /* 2417 Nala */
+	{ PCI_VDEVICE(ATHEROS, 0xff1b) }, /* AR5BXB63 */
 	{ 0 }
 };
 MODULE_DEVICE_TABLE(pci, ath5k_pci_id_table);