cx18: Fix unintended auto configurations in cx18-av-core

[Andy Walls <awalls@xxxxxxxxx>]

At

http://linuxtv.org/hg/~awalls/v4l-dvb/

I have just pushed a change to the cx18-av-core code so that accesses to
cx23418 av core that cause auto-configuration will be adjusted to
emulate the auto-configuration behavior of the cx25843. This fixes the
VBI displayed as rapidly changing B&W video at the top of the frame for
NTSC and probably other things as well.


The strategy I took of saving and restoring registers makes the change
less invasive to the cx18-av-core.c code.  I wasn't up for a rewrite of
the entire cx18-av-*c code.  Plus, fixes for the cx25840 module will
still be relatively easy to apply to the cx18-av-*c code without an
extensive rewrite.

-Andy

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