This commit converts the existing hcm5883l 3-axis magnetometer
driver to use device tree for the I2C and GPIO selection.
It also adds a basic sample application for this sensor, using the
frdm-k64f development board to demonstrate how the interrupt
GPIO pin and I2C bus can be selected.
Signed-off-by: Kevin Townsend <kevin@ktownsend.com>
Kevin Townsend