Regression at gspca core affecting SXGA mode on sn9c201 driver

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Hi Jean-Fronçois,

git commit 35680baa6822df98a6ed602e2380aa0a04e18b07 (see enclosed) caused not only a regression
at PS/3 Eye webcam (git commit f43402fa55bf5e7e190c176343015122f694857c), but also at sn9c201 driver, 
when used on SXGA mode. What happens is that only the highest alternate mode is enough for the 
maximum resolution.

I suspect that other drivers broke due to that change. So, IMO, the better is to revert and work
on another alternative. 

Btw, no matter what resolution is used, sn9c201 is setting the same alternate for all modes,
spending more USB bandwidth than needed. Why gspca is just getting the highest value for 
wMaxPacketSize? It should, instead, seek for the minimum packet size that is needed for a
given resolution.

I'll try to play with it, to fix the max res at least for sn9c201 driver.

Cheers,
Mauro
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