增加LED状态显示功能：

1、设备上电红灯红灯常亮
2、设备连接上COM口红灯闪烁
3、设备连接上BLE绿灯常亮
4、设备进入OTA绿灯闪烁

cpu/br28/tools/sdk.elf.resolution.txt

@@ -1614,6 +1614,7 @@ obj/Release/apps/earphone/app_main.o
 -r=obj/Release/apps/earphone/app_main.o,usr_read_device_sta,l
 -r=obj/Release/apps/earphone/app_main.o,usr_prodcode_init,l
 -r=obj/Release/apps/earphone/app_main.o,dengle_sched_init,l
+-r=obj/Release/apps/earphone/app_main.o,usr_led_status_init,l
 -r=obj/Release/apps/earphone/app_main.o,usr_clear_pair_info_noreset,l
 -r=obj/Release/apps/earphone/app_main.o,ui_manage_init,l
 -r=obj/Release/apps/earphone/app_main.o,ui_update_status,l
@@ -3392,6 +3393,19 @@ obj/Release/apps/usr_le_code/usr_le_recieve.o
 -r=obj/Release/apps/usr_le_code/usr_le_recieve.o,usr_auth_data,pl
 -r=obj/Release/apps/usr_le_code/usr_le_recieve.o,usr_var,l
 obj/Release/apps/usr_le_code/usr_le_recieve_demo.o
+obj/Release/apps/usr_le_code/usr_led_status.o
+-r=obj/Release/apps/usr_le_code/usr_led_status.o,usr_led_status_init,pl
+-r=obj/Release/apps/usr_le_code/usr_led_status.o,sys_timer_add,l
+-r=obj/Release/apps/usr_le_code/usr_led_status.o,usr_led_status_run,pl
+-r=obj/Release/apps/usr_le_code/usr_led_status.o,usr_led_status_get_status,pl
+-r=obj/Release/apps/usr_le_code/usr_led_status.o,gpio_set_die,l
+-r=obj/Release/apps/usr_le_code/usr_led_status.o,gpio_set_pull_up,l
+-r=obj/Release/apps/usr_le_code/usr_led_status.o,gpio_set_pull_down,l
+-r=obj/Release/apps/usr_le_code/usr_led_status.o,gpio_direction_output,l
+-r=obj/Release/apps/usr_le_code/usr_led_status.o,cdc_is_com_open,l
+-r=obj/Release/apps/usr_le_code/usr_led_status.o,usr_get_conn_service,l
+-r=obj/Release/apps/usr_le_code/usr_led_status.o,usr_get_ota_status,l
+-r=obj/Release/apps/usr_le_code/usr_led_status.o,puts,l
 obj/Release/apps/usr_le_code/usr_usb_jb.o
 -r=obj/Release/apps/usr_le_code/usr_usb_jb.o,usr_ble_rx_msgid_save,pl
 -r=obj/Release/apps/usr_le_code/usr_usb_jb.o,printf,l