ASoC: dt-bindings: renesas,rsnd: remove post-init-providers property

ASoC: dt-bindings: renesas,rsnd: remove post-init-providers property

commit f8da001ae7a ("ASoC: audio-graph-card2: Purge absent supplies for
device tree nodes") marks multi/dpcm/c2c nodes as no suppliers. We no
longer need to use post-init-providers property to break fw_devlink cycle
(And no one is using it yet). Let's remove it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/87ikrhrfws.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>