测试 msm8916->pm8916->mmp-MPP2 (多功能引脚)ADC 功能。

MPP引脚可以作为一下功能使用：
Pulse width modulator Dimming control of external WLED driver （pwm）;
Home row LED driver Current sink through even MPPs(sink);
Other current drivers Even MPPs can be configured to sink up to 40 mA
ATC indicator (see input power management features);
Vibration motor driver 1.2 to 3.1 V in 100 mV increments(power);
ADC;
I/O;

详细餐卡pm8916的spec lm80-p0436-35_a_pm8916-pm8916-1_device_spec.pdf
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