V4L/DVB (9011): S2API: A number of cleanusp from the last 24 months.

I was given these changes by Darron Broad and Igor Liplianin and represent a series
of patches they've been making to the cx24116 driver over the last two years.

Changes for handling symbolrates >30Ksps
Tone handling changes.
Diseqc support.
Sleep support, shutting down the clocks correctly.
Cleanup on ROLL_OFF and PILOT support.

*** ST - We need to cleanup the sysclt control, this is abnormal
    in a demod driver. We should work towards understanding the missing
    API's and ensure we have them in S2API.  ***
Signed-off-by: Steven Toth <stoth@linuxtv.org>
Signed-off-by: Darron Broad <darron@kewl.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>