iio: accel: adxl345: Pass function pointer to core

Provide a way for bus specific pre-configuration by adding a function
pointer argument to the driver core's probe() function, and keep
the driver core implementation bus independent.

In case NULL was passed, a regmap_write() shall initialize all bits of
the data_format register, else regmap_update() is used. In this way
spi and i2c are covered.

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

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