iio: dac: ltc1660: Switch to DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr()

Using these newer macros allows the compiler to remove the unused
structure and functions when !CONFIG_PM_SLEEP + removes the need to
mark pm functions __maybe_unused.

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

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