PMIC does not readout battery voltage properly
When trying to read the battery voltage, the PMIC always returns 3.22 V
The other values look like this:
[ 42030] pmic: PMIC_AMUX_CHGIN_U at 4.977 V
[ 42035] pmic: PMIC_AMUX_CHGIN_I at 0.018 V
[ 42041] pmic: PMIC_AMUX_BATT_U at 3.222 V
[ 42047] pmic: PMIC_AMUX_BATT_CHG_I at 0.005 V
[ 42054] pmic: PMIC_AMUX_SYS_U at 3.375 V