Add sysfs attributes Documentation entries for LJCA device
+
+What: /sys/bus/usb/.../ljca_enable_dfu
+Date: July 2023
+KernelVersion: 6.4
+Contact: Ye Xiang<xiang.ye@xxxxxxxxx>
+Description:
+ Writing 1 to this file to force the LJCA device into DFU
+ mode so the firmware can be updated. After firmware
+ updating has been done, the device will back to normal
+ working mode.