Bump the firmware for carl9170 from 1.9.6 to 1.9.9

Update the firmware for carl9170 from version 1.9.6 to 1.9.9 (latest from http://wireless.kernel.org/en/users/Drivers/carl9170 ).

Verified using a TP-Link TL-WN821N [Atheros AR9170] with a Raspbery Pi with current OpenElec build devel-20141204204231-r19725-g9b43436.

The updated firmware resolves multiple issues with unstable WiFi (e.g. "invalid plcp cck rate" and repeated device resets).