[automerger skipped] Merge "Add default and nullable annotations to...

[automerger skipped] Merge "Add default and nullable annotations to NetworkStack AIDLs." into rvc-dev am: 023ee726 am: 2bf64d35 am: 632bd1b7 am: b3f84f55 -s ours am: 1271bd41 -s ours

am skip reason: Change-Id Ie2ecd84919a59adf89d0c56e4fdf2b2258fa1448 with SHA-1 2286603c is in history

Change-Id: I4f2033a787cfe0bebcf841d2c93db65227445d48