ath: rename regulatory rules

Regulatory rule defines in regd.c are used not only by ath9k but also
ath10k driver (haven't test other drivers) and thus should be
renamed from ATH9K* to ATH*.

Signed-off-by: Tomislav Požega <pozega.tomislav@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>