[lm-sensors] AsRock Z68 Pro3-M configuration

[CC]

The actual data for the AsRock Z68 Pro3-M is:

        label in1 "+12V"
        compute in1 @*6.6,@/6.6
        set in1_min 11.400
        set in1_max 12.600

        label in5 "+5V"
        compute in5 @*3,@/3
        set in5_min 4.750
        set in5_max 5.250

        label fan1 "CHA_FAN1"
        label fan2 "CPU_FAN"
        ignore fan3
        label fan4 "PWR_FAN"
        label fan5 "CHA_FAN2"

There's one rogue in4 that has very low, but changing values. They are
between 0.01V and 0.03V.

Best,  CC