Freeze NetworkStack AIDL interface for v11. am: f5014f43a7 am: fc36f3b083 am: 5e4719aebd

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/1438152

Change-Id: I2d0b3a5ae80990715cd8f7a4c5946270e5c91dd9