[pvrusb2] [patch] fix black screen after encoder start (saa7115)

[Martin Dauskardt]

Some time ago I reported the problem, that after starting a read access the 
screen is sometimes black. 
http://www.isely.net/pipermail/pvrusb2/2009-October/002637.html

This is definetely a timing issue. A similar problem existed in the ivtv 
driver and was solved 2007 by adding a 300ms sleep. Obviously only devices 
with saa7115 digitizer are effected.
This has been discussed again in December and January on 
<http://article.gmane.org/gmane.linux.drivers.video-input-
infrastructure/14332>

The attached patch fixes the problem in a similar way for the pvrusb2 driver.
I reverted also a previous increase for another delay as this was the wrong 
place.

Greets,
Martin
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