ASoC: sun4i-spdif: Always set the valid data to be the MSB

This doesn't affect 16bit formats and allows us to properly run
24bit formats.

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
Link: https://patch.msgid.link/20241111165600.57219-3-codekipper@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>