ASoC: Mediatek: MT8183: change supported formats of DL2 and UL1

DL2 and UL1 are for BTSCO.  They should only provide 16-bit, mono,
8kHz and 16kHz to userspace.  Change the formats accordingly.

Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Signed-off-by: Mark Brown <broonie@kernel.org>