ath9k_hw: simplify revision checks for AR9285

Since AR9285 v1.0 and v1.1 were never sold (and the initvals removed),
its revision checks can be simplified similar to AR9280

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/ar5008_phy.c b/drivers/net/wireless/ath/ath9k/ar5008_phy.c
index 9318ae7..79dfe9d 100644
--- a/drivers/net/wireless/ath/ath9k/ar5008_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar5008_phy.c
@@ -701,7 +701,7 @@
 	u32 phymode;
 	u32 enableDacFifo = 0;
 
-	if (AR_SREV_9285_10_OR_LATER(ah))
+	if (AR_SREV_9285_12_OR_LATER(ah))
 		enableDacFifo = (REG_READ(ah, AR_PHY_TURBO) &
 					 AR_PHY_FC_ENABLE_DAC_FIFO);