加入通道轮询宏定义，当宏为1时代表通道可++，代表四通道，反之为单通道

1. 在chrg_def.h中新增多通道轮询配置宏CHRG_MULTI_CHANNEL，以及对应通道自增宏CHRG_CHANNEL_NEXT
2. 将chrg_roll_sou.c和chrg_roll_nor.c中的原生index++替换为CHRG_CHANNEL_NEXT(index)
3. 实现单/多通道硬件的兼容适配

apps/chrg/applications/thread/chrg_roll_nor.c

@@ -997,17 +997,17 @@ void chrg_roll_nor_thread_entry (void *data)
 			rt_mutex_release(pTHR->mutex);
 			if (state_work_ret != 0) {
 				/* 南向状态动作未成功入队时保留原状态，下轮重试且禁止北向先行。 */
-				index++;
+				CHRG_CHANNEL_NEXT(index);
 				rt_thread_mdelay(2);
 				continue;
 			}
 			if (source_waiting || sink_waiting) {
-				index++;
+				CHRG_CHANNEL_NEXT(index);
 				rt_thread_mdelay(2);
 				continue;
 			}
 			if (0 == pNOR->enable[idx]) {
-				index++;
+				CHRG_CHANNEL_NEXT(index);
 				rt_thread_mdelay(2);
 				continue;
 			} else {
@@ -1018,7 +1018,7 @@ void chrg_roll_nor_thread_entry (void *data)
 				(void)chrg_roll_nor_auto_request(idx, pSW,
 					pTHR, pTN, pNOR);
 			}
-			index++;
+			CHRG_CHANNEL_NEXT(index);
 			rt_thread_mdelay(NORTH_POLL_INTERVAL_MS);
 			continue;
 		}

apps/chrg/applications/thread/chrg_roll_sou.c

@@ -820,7 +820,7 @@ void chrg_roll_sou_thread_entry (void *data)
 			idx = index%(TOTAL_SOU_CHS); // [0, 3]
 			response_part = pROLL->part;
 			if (0 == chrgsouth.enable[idx]) {	// 通道未启用
-				index++;
+				CHRG_CHANNEL_NEXT(index);
 				rt_thread_mdelay(10);
 				continue;
 			} else {						// 通道启用
@@ -837,7 +837,7 @@ void chrg_roll_sou_thread_entry (void *data)
 					chrg_eload_refresh(ID_ELOAD, pROLL->part);
 				}
 				if (pROLL->part < TOTAL_MB_R) {
-					index++;
+					CHRG_CHANNEL_NEXT(index);
 				}
 			}
 		}

apps/chrg/applications/utils/chrg_def.h

@@ -12,6 +12,19 @@
 
 #include <rtthread.h>
 
+/*
+ * Channel polling mode:
+ * 1 - multi-channel hardware, advance the polling channel index;
+ * 0 - single-channel hardware, keep polling channel 0.
+ */
+#define CHRG_MULTI_CHANNEL  1
+
+#if CHRG_MULTI_CHANNEL
+#define CHRG_CHANNEL_NEXT(index)  do { (index)++; } while (0)
+#else
+#define CHRG_CHANNEL_NEXT(index)  do { } while (0)
+#endif
+
 // 4路选通
 typedef enum {
 	IDX_CH1 = 0,			// 通路1