iio: proximity: sx9310: Switch to DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr()

These new macros avoid the need for marking the callbacks __maybe_unused
whilst ensuring both callbacks and structure may be dropped by the compiler
if CONFIG_PM_SLEEP is not enabled.

Signed-off-by: Jonathan Cameron <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Cc: Gwendal Grignou <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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