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 7370645c4be5b2056b573b5be7436136f1fb4184 and subsequent
ccf5b653abb80cd95b4bf991951839e22aa7f75d were meant to clear up noise.

Unfortunately, noise persisted for those using higher sample rates and
this was only solved by commit 480503df3470e9b8f3f705c136a959b863be06ca

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>