linux-phytec-fsl

ath9k_hw: remove support for UB124 tx gain table

UB124 is a USB based reference design not supported by ath9k or
ath9k_htc.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>