ASoC: rockchip: i2s: Use managed hclk and runtime PM cleanup

The Rockchip I2S driver mixes devm-managed probe resources with manual
runtime PM and hclk cleanup.  This leaves the remove path doing runtime PM
shutdown and clock disable before devm-managed ASoC and PCM resources are
released.

Keep the bus clock enabled for the device lifetime with
devm_clk_get_enabled(), and move the runtime PM teardown into devres so the
unwind order matches the managed registrations.  This also removes the
remove callback, which only existed for cleanup.

Use a devm action for the final runtime suspend and register it before the
managed runtime PM action, so teardown disables runtime PM before forcing
the device into the suspended state.

Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://patch.msgid.link/20260521-asoc-rockchip-i2s-devm-cleanup-v1-1-9319bd781393@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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