[media] Documentation: README.ivtv: Remove note that ivtvfb is not yet in the kernel

ivtvfb is now in the kernel, so stop saying it's not.

Signed-off-by: Paul Cassella <[e-mail]>
Signed-off-by: Andy Walls <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

Documentation/video4linux/README.ivtv

···
  * Provides comprehensive OSD (On Screen Display: ie. graphics overlaying the
    video signal)
  * Provides a framebuffer (allowing X applications to appear on the video
-   device) (this framebuffer is not yet part of the kernel. In the meantime it
-   is available from www.ivtvdriver.org).
+   device)
  * Supports raw YUV output.
 
 IMPORTANT: In case of problems first read this page: