iio: proximity: srf04: Use pm_ptr() to remove unused struct dev_pm_ops

If CONFIG_PM is not set, the pm_ptr() will ensure that the struct
dev_pm_ops and callbacks are removed without the need for __maybe_unused
markings.

In this case we can't simply use DEFINE_RUNTIME_DEV_PM_OPS() because
that would provide suspend and resume functions without the
checks the driver is doing before calling runtime_pm functions
(whether the necessary GPIO is provided).  It may be possible to
clean that up in future by moving the checks into the callbacks.

Signed-off-by: Jonathan Cameron <[email protected]>
Cc: Andreas Klinger <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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