Remove adbd from bazel prod allowlist

This is to prepare for an imminent launch of bazel prod mode to all
users.

Note that this means a temporary test regression for bazel-built adbd, as
we have CI builds in place to verify adbd prod mode, and now we will
have no e2e coverage of mixed builds with adbd allowlisted. Still, this
test regression should hopefully be shortlived, as we begin launching
bazel-built build chunks as part of feature rollout in the coming weeks.

Test: Treehugger
Change-Id: I3c34ce91ac3454d1f71340a0fa03951f2e69f203