Tone alarm stuff.

Signed-off-by: cctsao1008 <chiacheng.tsao@gmail.com>
Merge branch 'mpu6050' into hmc5883
Enable MPU6050 AUX I2C bypass mode for I2C master to access HMC5883 and MS5611, Disable GPIO beep tone.

Signed-off-by: cctsao1008 <chiacheng.tsao@gmail.com>
Merge branch 'hmc5883' into alpha