port srcEncRMJPEG readme

a. add srcEncRMJPEG.c to mcp core\src\dvr\net\streaming\	
b. define REARVIEW_STREAMING_TEST in config_fw.h	
c. use rtsp://192.72.1.1/liveRTSP/rv/ to open rear view, and put 123_1.avi in SD card root path
d. you can get 123_1.avi in Y:\Chrison_Feng