SIB1 optional parameters, Cell start request, stop request and slot indication

PatchSet 5:
Modified :
 1. mac_msg_hdl.c
 2. rg.h
 3. du_mgr.h
 4. du_msg_hdl.c

PatchSet 4:
deleted :
 1. mac_main.h
modified :
 1. mac_msg_hdl.c
 2. mac_upr_int_api.h
 3. rg.h
 4. du_mgr.h
 5. du_msg_hdl.c

Change-Id: I857386e4d028f1ee85711eaa650978f4e2d85a55
Signed-off-by: Balaji Shankaran <balaji.shankaran@radisys.com>