driver: sensor: Add BMM150 Geomagnetic sensor driver

This patch implements BMM150 driver with polling mode and its tested
with original BMM150 sensor hardware. Driver works on I2C
interface as of now.

Following datasheet is taken as reference while developing driver.
http://www.mouser.com/ds/2/783/BST-BMM150-DS001-01-786480.pdf



Signed-off-by: Punit Vara <punit.vara@intel.com>