rtl8180: assign sequence numbers in the driver

This is a step towards support for beaconing modes of operation.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rtl818x/rtl8180.h b/drivers/net/wireless/rtl818x/rtl8180.h
index de3844f..b92d678 100644
--- a/drivers/net/wireless/rtl818x/rtl8180.h
+++ b/drivers/net/wireless/rtl818x/rtl8180.h
@@ -78,6 +78,9 @@
 	u32 anaparam;
 	u16 rfparam;
 	u8 csthreshold;
+
+	/* sequence # */
+	u16 seqno;
 };
 
 void rtl8180_write_phy(struct ieee80211_hw *dev, u8 addr, u32 data);