[PATCH] wireless/airo: Remove 'Setting transmit key' info messages

These messages end up polluting logs when things like NetworkManager or
wpa_supplicant are controlling the driver.  They aren't really that
useful, and no other drivers output messages like this when the user
fiddles with encryption keys.  Users can use iwconfig and other
wireless-tools methods to determine and change the current transmit key
if they wish to do so manually.  Therefore, remove the messages.

Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>