Quoting Jonathan Cameron (2022-12-04 10:08:12)

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

SIMPLE_DEV_PM_OPS() is deprecated as it requires explicit protection
against unused function warnings.  The new combination of pm_sleep_ptr()
and DEFINE_SIMPLE_DEV_PM_OPS() allows the compiler to see the functions,
thus suppressing the warning, but still allowing the unused code to be
removed. Thus also drop the __maybe_unused markings.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Stephen Boyd <redacted>
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Reviewed-by: Stephen Boyd <redacted>