[thread] loose the restrictions on ThreadNetworkManager APIs am: 17740cb799 am: aa40feb10f

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

Change-Id: I281ef398f40d47589eac9f6ff99d9e5bb282e91d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>