fix: 修复审查发现的4个高危问题

1. UartDebug: RS485通道1关闭指令误操作通道2,修正'u'升降级通道混淆
2. bsp: GPIOInit新增PA3(ADC电源控制引脚)初始化为输出
3. main.h: Nonce从int16_t改为uint16_t,消除rand()溢出导致LPTimer0延时异常
4. SGCP: SUB_STATUS_BROADCAST_SYNC_TIME调用ToSDSetColTime改为ToSDSyncTime

source/src/SGCP.c

@@ -1355,7 +1355,7 @@ void SubRevLoopHandler(void)
 		break;}
 		
 		case SUB_STATUS_BROADCAST_SYNC_TIME:{
-			ToSDSetColTime(0x00, App.Para.Layout.TimeStamp);
+			ToSDSyncTime(0x00, App.Para.Layout.TimeStamp);
 			SGCP.SubStatus = SUB_STATUS_IDLE;
 		break;}
 	}