ALSA: usb-audio: Avoid superfluous endpoint setup

[ Upstream commit 1045f5f1 ]

After splitting to snd_usb_endpoint_set_params() and *_prepare(), the
skip of each function should be checked with different flags, while we
still use ep->need_setup as the single one.  Introduce
ep->need_prepare for indicating the need of prepare, and also add the
missing check of ep->need_setup at the set_params.

Fixes: 2be79d58 ("ALSA: usb-audio: Split endpoint setups for hw_params and prepare (take#2)")
Link: https://lore.kernel.org/r/20221009104212.18877-5-tiwai@suse.de


Signed-off-by: Takashi Iwai <tiwai@suse.de>
Stable-dep-of: 7822baa8 ("ALSA: usb-audio: add quirk for RODE NT-USB+")
Signed-off-by: Sasha Levin <sashal@kernel.org>