media: cx23885: Module option to disable analog video

Initialized and left to themselves some boards with analog inputs,
on some modern platforms can throw critical errors which prevents
even digital from working thereafter. If analog is never used this
module parameter allows analog to be disabled on a card by card
basis.

It is already possible to disable analog audio.

For example, to disable for Hauppauge QuadHD with analog functionality:

options cx23885 disable_analog_video=56,57

can be placed insode of /etc/modprobe.d/cx23885.conf

Signed-off-by: Bradford Love <brad@nextdimension.cc>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

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