Rewrite auto prebuilts to external/auto

Remove last references to auto-common and auto-value-annotations.

Bug: 158870037
Test: m checkbuild
Change-Id: I64d22f1492246ff31da5966e2f47e8a89cf54182
Merged-In: I64d22f1492246ff31da5966e2f47e8a89cf54182
2 files changed