iio: accel: adxl345: Set driver_data for OF enumeration

In order to enable this driver on mode platforms, assign driver_data
field in the OF device ID table.

While at it, make sure that device type is not 0 which may be wrongly
interpreted by device property APIs in the future.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Link: https://lore.kernel.org/r/20220222090009.2060-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>