rt2x00: use ratelimited variants dev_warn/dev_err

As reported by Randy we can overwhelm logs on some USB error conditions.
To avoid that use dev_warn_ratelimited() and dev_err_ratelimitd().
Reported-and-tested-by: Randy Oostdyk <linux-kernel@oostdyk.com>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ralink/rt2x00/rt2x00.h

@@ -69,10 +69,10 @@
 	printk(KERN_ERR KBUILD_MODNAME ": %s: Error - " fmt,		\
 	       __func__, ##__VA_ARGS__)
 #define rt2x00_err(dev, fmt, ...)					\
-	wiphy_err((dev)->hw->wiphy, "%s: Error - " fmt,			\
+	wiphy_err_ratelimited((dev)->hw->wiphy, "%s: Error - " fmt,	\
 		  __func__, ##__VA_ARGS__)
 #define rt2x00_warn(dev, fmt, ...)					\
-	wiphy_warn((dev)->hw->wiphy, "%s: Warning - " fmt,		\
+	wiphy_warn_ratelimited((dev)->hw->wiphy, "%s: Warning - " fmt,	\
 		   __func__, ##__VA_ARGS__)
 #define rt2x00_info(dev, fmt, ...)					\
 	wiphy_info((dev)->hw->wiphy, "%s: Info - " fmt,			\