device_iot_config: Add new iot config apis to store remote info(2/2)

device_iot_config apis are used to store remote device info
to local conf. For the remote info, please refer to
device_iot_conf_defs.h

CRs-Fixed: 2333805
Change-Id: I020ce3beb34550278fff6a5040e1294de68aaa72
4 files changed