V4L/DVB (5466): Fix up some Cafe CCIC delay issues

Fix up unsociable Cafe CCIC delays.

The Cafe CCIC driver contains some lengthy delays, some of which are
unnecessary and some of which are done under lock.  Some were marked
with comments, but the comments somehow failed to make the issue go
away.  So fix it for real.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>