ath9k: Store subsystem id in struct hw_version

This subsystem id will be used later to turn on the btcoex
support.

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/pci.c b/drivers/net/wireless/ath/ath9k/pci.c
index 8b28814..903dd8a 100644
--- a/drivers/net/wireless/ath/ath9k/pci.c
+++ b/drivers/net/wireless/ath/ath9k/pci.c
@@ -88,6 +88,7 @@
 	struct ath_softc *sc;
 	struct ieee80211_hw *hw;
 	u8 csz;
+	u16 subsysid;
 	u32 val;
 	int ret = 0;
 	struct ath_hw *ah;
@@ -178,7 +179,8 @@
 	sc->mem = mem;
 	sc->bus_ops = &ath_pci_bus_ops;
 
-	ret = ath_init_device(id->device, sc);
+	pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &subsysid);
+	ret = ath_init_device(id->device, sc, subsysid);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to initialize device\n");
 		goto bad3;