V4L/DVB (9468): Miscellaneous fixes

 - Fix a bitfield
 - Set gain appropriately
 - Slept for the wrong duration

Signed-off-by: Reinhard Nissl <rnissl@gmx.de>
Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>