Move I2C-specific code into its own file and rely on regmap to access
registers. The core code provides access to x, y, z and scale readings.
Signed-off-by: NEva Rachel Retuya <eraretuya@gmail.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>