ALSA: usb-audio: disable implicit feedback sync for Behringer UFX1204 and UFX1604

ALSA: usb-audio: disable implicit feedback sync for Behringer UFX1204 and UFX1604

Behringer UFX1204 and UFX1604 have Synchronous endpoints to which
current ALSA code applies implicit feedback sync as if they were
Asynchronous endpoints. This breaks UAC compliance and is unneeded.

The commit ade2a1abdeb694a80df5ddf44de10df7c2670627 and subsequent
416d40d74bac498cda367b8750f25b38f814d976 were meant to clear up noise.

Unfortunately, noise persisted for those using higher sample rates and
this was only solved by commit f90bfad79edf7720f00be15c65f666c719574295

Since there are no more reports of noise, let's get rid of the
implicit-fb quirks breaking UAC compliance.

Signed-off-by: Geraldo Nascimento <geraldogabriel@gmail.com>
Link: https://lore.kernel.org/r/YVYSnoQ7nxLXT0Dq@geday
Signed-off-by: Takashi Iwai <tiwai@suse.de>