V4L/DVB (7900): pvrusb: Fix Kconfig if DVB=m V4L_core=y

As reported by Ingo Molnar:

x86.git testing found the following build failure:

  drivers/built-in.o: In function `pvr2_dvb_feed_thread':
  pvrusb2-dvb.c:(.text+0x127e78): undefined reference to `dvb_dmx_swfilter'
  drivers/built-in.o: In function `pvr2_dvb_adapter_exit':
  pvrusb2-dvb.c:(.text+0x128357): undefined reference to `dvb_net_release'
  pvrusb2-dvb.c:(.text+0x12836f): undefined reference to `dvb_dmxdev_release'
  [...]

with this config:

  CONFIG_VIDEO_PVRUSB2=y
  CONFIG_DVB_CORE=m

i.e. pvrusb2 is built-in, dvb-core is modular.
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/pvrusb2/Kconfig

 config VIDEO_PVRUSB2
 	tristate "Hauppauge WinTV-PVR USB2 support"
 	depends on VIDEO_V4L2 && I2C
+	depends on VIDEO_MEDIA	# Avoids pvrusb = Y / DVB = M
 	depends on HOTPLUG	# due to FW_LOADER
 	select FW_LOADER
 	select VIDEO_TUNER