media: stk1160: fix control-message timeouts

USB control-message timeouts are specified in milliseconds and should
specifically not vary with CONFIG_HZ.

Fixes: 9cb2173e ("[media] media: Add stk1160 new driver (easycap replacement)")
Cc: stable@vger.kernel.org      # 3.7
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>