fix(boards): Remove redundant AXP2101 charging configuration for Waveshare ESP32-C6-Touch-AMOLED-2.16

- These settings were causing conflicts with the on-chip fuel gauge reference configuration
- Simplify power initialization by relying on BSP defaults instead of overriding them

firmware/src/boards/waveshare_amoled_216_c6/power.cpp

@@ -33,10 +33,6 @@ void power_hal_init(void) {
     // Mirror the Waveshare XiaoZhi BSP charging config so the on-chip
     // fuel gauge has the right reference numbers. Without these,
     // getBatteryPercent() returns -1 / shows "---" on the UI.
-    pmu.setChargeTargetVoltage(XPOWERS_AXP2101_CHG_VOL_4V1);
-    pmu.setChargerConstantCurr(XPOWERS_AXP2101_CHG_CUR_400MA);
-    pmu.setChargerTerminationCurr(XPOWERS_AXP2101_CHG_ITERM_25MA);
-    pmu.setPrechargeCurr(XPOWERS_AXP2101_PRECHARGE_50MA);
 
     pmu.disableIRQ(XPOWERS_AXP2101_ALL_IRQ);
     pmu.clearIrqStatus();