ASoC: simple-card: Fix up checks for HW param fixups

The "convert-xxx" properties only have an effect for DPCM DAI links.
A DAI link is only created as DPCM if the device tree requires it;
part of this involves checking for the use of "convert-xxx" properties.

When the convert-sample-format property was added, the checks got out
of sync. A DAI link that specified only convert-sample-format but did
not pass any of the other DPCM checks would not go into DPCM mode and
the convert-sample-format property would be silently ignored.

Fix this by adding a function to do the "convert-xxx" property checks,
instead of open-coding it in simple-card and audio-graph-card. And add
"convert-sample-format" to the check function so that DAI links using
it will be initialized correctly.

Fixes: 047a05366f4b ("ASoC: simple-card-utils: Fixup DAI sample format")
Acked-by: Kuninori Morimoto <[email protected]>
Signed-off-by: Aidan MacDonald <[email protected]>
Acked-by: Sameer Pujar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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