ath9k_hw: set spectral scan enable bit on trigger for AR9003+

AR9002 code and the QCA AR9003+ reference code do the same.
Signed-off-by: NFelix Fietkau <nbd@nbd.name>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath9k/ar9003_phy.c

@@ -1800,6 +1800,8 @@ static void ar9003_hw_spectral_scan_config(struct ath_hw *ah,
 
 static void ar9003_hw_spectral_scan_trigger(struct ath_hw *ah)
 {
+	REG_SET_BIT(ah, AR_PHY_SPECTRAL_SCAN,
+		    AR_PHY_SPECTRAL_SCAN_ENABLE);
 	/* Activate spectral scan */
 	REG_SET_BIT(ah, AR_PHY_SPECTRAL_SCAN,
 		    AR_PHY_SPECTRAL_SCAN_ACTIVE);