[media] dvb-usb-v2: Fix cypress firmware compilation

ERROR: "usbv2_cypress_load_firmware" [drivers/media/dvb/dvb-usb-v2/dvb-usb-az6007.ko] undefined!

Cypress fimware will never be compiled properly, as the Makefile rule
is wrong.
Acked-by: Antti Palosaari <crope@iki.fi>
Reviewed-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-usb-v2/Makefile

 dvb_usbv2-objs = dvb_usb_core.o dvb_usb_urb.o usb_urb.o
 obj-$(CONFIG_DVB_USB_V2) += dvb_usbv2.o
 
-obj-$(DVB_USB_CYPRESS_FIRMWARE) += dvb_usb_cypress_firmware.o
+dvb_usb_cypress_firmware-objs = cypress_firmware.o
+obj-$(CONFIG_DVB_USB_CYPRESS_FIRMWARE) += dvb_usb_cypress_firmware.o
 
 dvb-usb-af9015-objs = af9015.o
 obj-$(CONFIG_DVB_USB_AF9015) += dvb-usb-af9015.o