I2C: Fix duty cycle

Change duty cycle to FAST_DUTY_CYCLE_2 to enable 400KHz bus speed.

Add asserts for I2C operations' return values.
Configs: Remove global hardcoded value for I2CD

The new I2C API can use multiple I2C busses simultaneously and the
bus is specified in sc_i2c_init().
lsm9ds0: WIP: Actually include in the build.

Bunch of fixes.

Currently disables lis302dl and enables lsm9ds0.