iio: adc: imx8qxp: Switch to DEFINE_RUNTIME_DEV_PM_OPS and pm_ptr()

Switching to these newer macros allows the compiler to remove
the unused functions and struct dev_pm_ops if !CONFIG_PM without
the need to mark anything __maybe_unused.

Signed-off-by: Jonathan Cameron <[email protected]>
Cc: Cai Huoqing <[email protected]>
Reviewed-by: Haibo Chen <[email protected]>
Reviewed-by: Paul Cercueil <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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