ath6kl: remove SEND_EVENT_TO_APP define

This was enabled by default but its pretty useless for upstream
given that its sendign some custom wireless event. These need
to be reviewed instead and a respective cfg80211 event / call
should be used later.

Cc: Naveen Singh <nsingh@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>