ath9k_hw: merge the ar9287 version of ath9k_hw_get_gain_boundaries_pdadcs

Also add a comment about a potential array overrun that needs to
be reviewed.

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