wifi: ath9k: silence array-bounds warning on GCC 12

GCC 12 says:

drivers/net/wireless/ath/ath9k/mac.c: In function ‘ath9k_hw_resettxqueue’:
drivers/net/wireless/ath/ath9k/mac.c:373:22: warning: array subscript 32 is above array bounds of ‘struct ath9k_tx_queue_info[10]’ [-Warray-bounds]
  373 |         qi = &ah->txq[q];
      |               ~~~~~~~^~~

I don't know where it got the 32 from, relegate the warning to W=1+.
Acked-by: Kalle Valo <kvalo@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/wireless/ath/ath9k/Makefile

@@ -45,6 +45,11 @@ ath9k_hw-y:=	\
 		ar9003_eeprom.o \
 		ar9003_paprd.o
 
+# FIXME: temporarily silence -Warray-bounds on non W=1+ builds
+ifndef KBUILD_EXTRA_WARN
+CFLAGS_mac.o += -Wno-array-bounds
+endif
+
 ath9k_hw-$(CONFIG_ATH9K_WOW) += ar9003_wow.o
 
 ath9k_hw-$(CONFIG_ATH9K_BTCOEX_SUPPORT) += btcoex.o \