iio: st_sensors: Use iio_device_claim/release_direct_mode() when relevant

The st_sensors_core driver hardcodes the content of the
iio_device_claim_direct_mode() and iio_device_release_direct_mode()
helpers. Let's get rid of this handcrafted implementation and use the
proper core helpers instead. Additionally, this lowers the tab level
(which is always good) and prevents the use of the ->currentmode
variable which is not supposed to be used like this anyway.

Cc: Denis Ciocca <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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