ASoC: renesas: fsi: refactor clock initialization

Move fsi_clk_init() from set_fmt() to the probe path.
This ensures that clock resources are acquired only once during device
initialization, instead of being looked up repeatedly whenever set_fmt()
is called.
Together with the previous conversion to devm_clk_get_optional(), the
driver can now probe successfully even when optional clocks are absent.
The set_rate() callbacks continue to validate that all required clocks
are available before applying hardware-specific configuration.

Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Suggested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
Link: https://patch.msgid.link/20260609113836.45079-9-phucduc.bui@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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