Revert "bp2build: allowlist //external/brotli/... and build libb..." am:...

Revert "bp2build: allowlist //external/brotli/... and build libb..." am: a73a503d am: 92e3b75c am: 6ba1352e

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1814736

Change-Id: Ic0077bc57deb88dc7dd9d3867aa791207860a7bd