[media] airspy: AirSpy SDR driver

AirSpy SDR driver.

Thanks to Youssef Touil and Benjamin Vernoux for support, help and
hardware!
http://airspy.com/Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/staging/media/Kconfig

@@ -19,6 +19,7 @@ menuconfig STAGING_MEDIA
 if STAGING_MEDIA
 
 # Please keep them in alphabetic order
+source "drivers/staging/media/airspy/Kconfig"
 source "drivers/staging/media/as102/Kconfig"
 
 source "drivers/staging/media/bcm2048/Kconfig"

drivers/staging/media/Makefile

+obj-$(CONFIG_USB_AIRSPY)	+= airspy/
 obj-$(CONFIG_DVB_AS102)		+= as102/
 obj-$(CONFIG_I2C_BCM2048)	+= bcm2048/
 obj-$(CONFIG_DVB_CXD2099)	+= cxd2099/

drivers/staging/media/airspy/Kconfig

+config USB_AIRSPY
+	tristate "AirSpy"
+	depends on USB && VIDEO_DEV && VIDEO_V4L2 && I2C
+	select VIDEOBUF2_VMALLOC
+	default m if !MEDIA_SUBDRV_AUTOSELECT

drivers/staging/media/airspy/Makefile

+obj-$(CONFIG_USB_AIRSPY)              += airspy.o