ath9k_hw: simplify revision checks for AR9287

Since AR9287 v1.0 was 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/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 1f41b451..25ed65a 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1989,7 +1989,7 @@
 	if (AR_SREV_9300_20_OR_LATER(ah))
 		pCap->hw_caps |= ATH9K_HW_CAP_RAC_SUPPORTED;
 
-	if (AR_SREV_9287_10_OR_LATER(ah) || AR_SREV_9271(ah))
+	if (AR_SREV_9287_11_OR_LATER(ah) || AR_SREV_9271(ah))
 		pCap->hw_caps |= ATH9K_HW_CAP_SGI_20;
 
 	if (AR_SREV_9285(ah))
@@ -2073,7 +2073,7 @@
 		return MS_REG_READ(AR9300, gpio) != 0;
 	else if (AR_SREV_9271(ah))
 		return MS_REG_READ(AR9271, gpio) != 0;
-	else if (AR_SREV_9287_10_OR_LATER(ah))
+	else if (AR_SREV_9287_11_OR_LATER(ah))
 		return MS_REG_READ(AR9287, gpio) != 0;
 	else if (AR_SREV_9285_12_OR_LATER(ah))
 		return MS_REG_READ(AR9285, gpio) != 0;