ASoC: dt-bindings: audio-graph-port: enable both flag/phandle for bitclock/frame-master

snd_soc_daifmt_parse_clock_provider_raw() is handling both
bitclock/frame-master, and is supporting both flag/phandle.
Current DT is assuming it is flag style.
This patch allows both case.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211216000018.2641925-1-kuninori.morimoto.gx@renesas.com


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