Revert "[Feature][T8TSK-216][system] boot from bl2_b when bl2_a is load fail"

This reverts commit 4917868dcaf4b97bbf210df3f366b6cf276dbcac.

Reason for revert: <INSERT REASONING HERE>

Change-Id: I6419efeb8d7cc167cab76e6c8b1d8d02b865f1da
diff --git a/src/bsp/hsm/src/application/bootloader/mt2735/bootloader.c b/src/bsp/hsm/src/application/bootloader/mt2735/bootloader.c
index b8b1d63..f0f1472 100644
--- a/src/bsp/hsm/src/application/bootloader/mt2735/bootloader.c
+++ b/src/bsp/hsm/src/application/bootloader/mt2735/bootloader.c
@@ -313,9 +313,7 @@
 	int32_t bld_loaded = 0;
 	int32_t ret = BL_OK;
 	struct bdev *dev = NULL;
-	struct bdev *dev_b = NULL;
-	const uint8_t *label = (uint8_t *)"bl2_a";
-	const uint8_t *label_b = (uint8_t *)"bl2_b";
+	const uint8_t *label = (uint8_t *)"bl2";
 
 	for (i = 0; i < BOOT_DEVICE_NUM; i++) {
 		ret = BL_OK;
@@ -336,14 +334,8 @@
 				ret = partition_publish(device_name, 0, PARTITION_ATTR_ALL);
 				if (ret == 0) {
 					dev = bdev_open_by_label(label);
-					dev_b = bdev_open_by_label(label_b);
 					if (dev != NULL) {
 						device_name_new = dev->name;
-					}
-					else if (dev_b != NULL)
-					{
-						dev = dev_b;
-						device_name_new = dev->name;
 					} else {
 						ret = -1;
 					}
@@ -359,20 +351,7 @@
 				LOGD("boot\r\n");
 				break;
 			} else {
-				LOGE("load img a fail\r\n");
-				if (dev_b != NULL)
-				{
-					dev = dev_b;
-					device_name_new = dev->name;
-					ret = bl_load_ap_image(device_name_new, entry_addr);
-					if (ret == BL_OK) {
-						bld_loaded = 1;
-						LOGD("boot\r\n");
-						break;
-					}
-					LOGE("load img b fail\r\n");
-				}
-
+				LOGE("load img fail\r\n");
 				bl_flash_partition_deinit(boot_device_list[i], device_name);
 			}
 		}