ath9k: Fix phy info print message with AR9485 chipset.

The phy information print during driver init time doesn't show
the numeric part of the chip name properly for AR9485. This patch
addresses this issue by adding the string to the respective array.

Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>