iio:bma180: Add BMA250 chip support
the BMA250 has only 10-bit resolution; while the data readout registers have identical layout, the configuration is completely different compared to the BMA180 datasheet: http://ae-bst.resource.bosch.com/media/products/dokumente/bma250/BST-BMA250-DS002-05.pdf Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net> Cc: Oleksandr Kravchenko <o.v.kravchenko@globallogic.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>