staging: dt3155v4l: Remove printk noise

Most of the printk's in this driver are just noise. Proper error codes
are being returned so just remove the noise and clean up the whitespace
in the code due to the removal.

The two messages left in the probe are useful. Convert them to dev_info
messages.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>