Upgrade emulator to emu-master-dev build 7080978 am: cccc0b7873 am: 1f3acd3590 am: 84bd555439

Original change: https://android-review.googlesource.com/c/platform/prebuilts/android-emulator/+/1550566

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I56258c5e61436d61e46a9875a86b450b1bc5e790