rt2x00: Implement HW encryption (rt73usb)

rt73usb supports hardware encryption.
rt73usb supports up to 4 shared keys and up to 64 pairwise keys.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/Kconfig b/drivers/net/wireless/rt2x00/Kconfig
index f333f61..11f590d 100644
--- a/drivers/net/wireless/rt2x00/Kconfig
+++ b/drivers/net/wireless/rt2x00/Kconfig
@@ -156,6 +156,7 @@
 	depends on USB
 	select RT2X00_LIB_USB
 	select RT2X00_LIB_FIRMWARE
+	select RT2X00_LIB_CRYPTO
 	select CRC_ITU_T
 	---help---
 	  This adds support for rt2501 wireless chipset family.