Please correct a small error in compass_rm3100.c

[and-sh]

PNI Sensor Corporation recommend to start measurement after populating cycles registers

So this way is slightly incorrect

This way will be a little bit better

    busWrite(mag->busDev, RM3100_REG_TMRC, TMRC_DEFAULT);

    busWrite(mag->busDev, RM3100_REG_CCX1, CCX_DEFAULT_MSB);
    busWrite(mag->busDev, RM3100_REG_CCX0, CCX_DEFAULT_LSB);

    busWrite(mag->busDev, RM3100_REG_CCY1, CCY_DEFAULT_MSB);
    busWrite(mag->busDev, RM3100_REG_CCY0, CCY_DEFAULT_LSB);

    busWrite(mag->busDev, RM3100_REG_CCZ1, CCZ_DEFAULT_MSB);
    busWrite(mag->busDev, RM3100_REG_CCZ0, CCZ_DEFAULT_LSB);

    busWrite(mag->busDev, RM3100_REG_CMM, CMM_DEFAULT);