iio:magn:ak8975: Switch from CONFIG_PM guards to pm_ptr() etc

Letting the compiler remove these functions when the kernel is built
without CONFIG_PM support is simpler and less error prone than the
use of #ifdef based config guards.

Use the new DEFINE_RUNTIME_DEV_PM_OPS() macro to reduce boilerplate.

Removing instances of this approach from IIO also stops them being
copied into new drivers.

Acked-by: Matt Ranostay <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>
Cc: Jonathan Albrieux <[email protected]>
Cc: Linus Walleij <[email protected]>
Reviewed-by: Paul Cercueil <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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