media: dvb_frontend: Use wait_event_freezable_timeout() for freezable kthread

A freezable kernel thread can enter frozen state during freezing by
either calling try_to_freeze() or using wait_event_freezable() and its
variants. So for the following snippet of code in a kernel thread loop:
  wait_event_interruptible_timeout();
  try_to_freeze();

We can change it to a simple wait_event_freezable_timeout() and
then eliminate a function call.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

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