media: rtl2832_sdr: drop vb2_ops_wait_prepare/finish

Since commit 8878598 ("media: vb2: use lock if wait_prepare/finish
are NULL") it is no longer needed to set the wait_prepare/finish
vb2_ops callbacks as long as the lock field in vb2_queue is set.

Since the vb2_ops_wait_prepare/finish callbacks already rely on that field,
we can safely drop these callbacks.

This simplifies the code and this is a step towards the goal of deleting
these callbacks.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

drivers/media/dvb-frontends/rtl2832_sdr.c

@@ -947,8 +947,6 @@ static const struct vb2_ops rtl2832_sdr_vb2_ops = {
 	.buf_queue              = rtl2832_sdr_buf_queue,
 	.start_streaming        = rtl2832_sdr_start_streaming,
 	.stop_streaming         = rtl2832_sdr_stop_streaming,
-	.wait_prepare           = vb2_ops_wait_prepare,
-	.wait_finish            = vb2_ops_wait_finish,
 };
 
 static int rtl2832_sdr_g_tuner(struct file *file, void *priv,