* Bosch BMC150 magnetometer sensor

http://ae-bst.resource.bosch.com/media/products/dokumente/bmc150/BST-BMC150-DS000-04.pdf

Required properties:

  - compatible : should be one of:
                 "bosch,bmc150_magn"
                 "bosch,bmc156_magn"
                 "bosch,bmm150"
                 "bosch,bmm150_magn" (DEPRECATED, use bosch,bmm150)
  - reg : the I2C address of the magnetometer

Optional properties:

  - interrupts : interrupt mapping for GPIO IRQ

Example:

bmc150_magn@12 {
        compatible = "bosch,bmc150_magn";
        reg = <0x12>;
        interrupt-parent = <&gpio1>;
        interrupts = <0 1>;
};