[thread] loose the restrictions on ThreadNetworkManager APIs am: 17740cb799

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3535262

Change-Id: Ibedb1a521b788d30bd0479bbe88dca50104f2555
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>