ASoC: SOF: imx8: check imx_sc_pm_cpu_start() return value

imx8_run(), imx8x_run() and imx8_shutdown() check the return value of
every imx_sc_misc_set_control() call but ignore the one from
imx_sc_pm_cpu_start(), which propagates errors from imx_scu_call_rpc()
and can fail with -ETIMEDOUT, -EINVAL or -EPERM.

Reporting success after a failed start leaves the caller loading
firmware onto a core that is not running, and a failed shutdown is
similarly hidden from imx_chip_core_shutdown() callers, which do act on
the return value.

Propagate the error, matching imx95_core_shutdown() in imx9.c.

Signed-off-by: Ștefan Ghețu <stefanghetu9@gmail.com>
Link: https://patch.msgid.link/20260902175517.209406-1-stefanghetu9@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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