SPI Test Application

This application just retrieves the 'WHO AM I' register from the
Accelerometer from a LSM9DS0 connected via API.

The device datasheet can be found here:
https://www.adafruit.com/datasheets/LSM9DS0.pdf

Wiring information:

| LSM9DS0 pin | Quark SE Devboard  | Quark D2000 CRB |
|             | pin                | pin             |
|-------------+--------------------+-----------------|
| VIN         | VDD_HDR_3P3        | J25 pin 1       |
| CS_G        | GPIO24_SPI0_M_nCS0 | SS0             |
| CS_XM       | VDD_HDR_3P3        | J25 pin 1       |
| SCL         | GPIO24_SPI0_M_SCLK | CLK             |
| SDO_G       | GPIO24_SPI0_M_MISO | MISO            |
| SDO_XM      | Ground             | J25 pin 2       |
| SDA         | GPIO24_SPI0_M_MOSI | MOSI            |
| GND         | Ground             | J25 pin 2       |