Sensors: Update compass compensation in sensors' driver.

- Based on mpl v5.1.0.
- It would not affect the performance about e-compass.
- Supoort both grouper/tilapia.
- Add more debug message.
- cat ../iio:device1/compass_cali_test to perform this command.
Signed-off-by: Joseph Wu <Joseph_Wu@asus.com>

Change-Id: I230a6e55875d01cb607ddf3903152cc69770b0ec
3 files changed