iio: adc: rcar-gyroadc: Use pm_runtime_resume_and_get() and check in probe()

1 instance found using coccicheck script under review at:
https://lore.kernel.org/lkml/[email protected]/
The other instance changed did not check for failure of the
pm_runtime_get_sync() so that is added.

Note the remaining pm_runtime_get_sync() call is left alone because it
is not obvious what to do on failure to power up in remove()

This is a prequel to taking a closer look at the runtime pm in IIO drivers
in general.

Signed-off-by: Jonathan Cameron <[email protected]>
Cc: Marek Vasut <[email protected]>
Reviewed-by: Mauro Carvalho Chehab <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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