[Feature]add AT+RNDISDOWN to close rndis for ZK-versin in factory test

Only Configure: Yes
Affected branch: ZK-first-oem-release
Affected module: factory
Is it affected on both ZXIC and MTK: only MTK
Self-test: yes
Doc Update: No

Change-Id: I057863e723b94a012e41621f5295a113d913135d
2 files changed