[pvrusb2] speedup mythtv frequency changes

[Ingo Flaschberger]

Hi Mike,

I want to speed up frequency changes with mythtv.
Mythtv have the not really nice habit to always set Contrast, Saturation, 
Brightness and Hue.

It should be possible from the pvrusb2 driver only 
to update the i2c chips when really anything has changed and will speed 
up the changes.

As far as I have seen pvr2_hdw_commit_ctl in pvrusb2-hdw.c would be a good 
place to implement this?
Could pvr2_hdw_commit_ctl called with more than one thing to change??

Need some tips where to implement this.

bye,
 	ingo flaschberger

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