[media] airspy: move out of staging into drivers/media/usb

Move it out of staging into media like all the other SDR drivers
too. There is no good reasons to keep these SDR drivers in staging.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
diff --git a/drivers/media/usb/Kconfig b/drivers/media/usb/Kconfig
index f8c1099..38b6fe1 100644
--- a/drivers/media/usb/Kconfig
+++ b/drivers/media/usb/Kconfig
@@ -54,6 +54,7 @@
 
 if MEDIA_SDR_SUPPORT
 	comment "Software defined radio USB devices"
+source "drivers/media/usb/airspy/Kconfig"
 endif
 
 endif #MEDIA_USB_SUPPORT