iio: proximity: rfd77402: use i2c_client for rfd77402_{init,powerdown}()

These 2 functions only do I2C reads/writes and don't require any of the
private data of the driver.

They're also used in the PM suspend/resume part of the driver.

Converting them to take an i2c_client object as parameter simplifies things
a bit (especially in the suspend/resume) as the driver mostly needs the
reference for i2c_client, so no need to jump through hoops to get it from
the private data (as was done in many places).

The rfd77402_measure() function has also been converted to take an
i2c_client object, since it also does only I2C ops.

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

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