llvm_tools: Add lldb_server to updated_packages

This CL adds dev-util/lldb-server to the list of packages updated by
various tools. Additionally, it updates the default packages in
update_chromeos_llvm_hash.py so that we don't have to manually supply
them anymore, and refactors other scripts to use that list instead of
maintaining their own.

BUG=b:196602751
TEST=`python3 -m unittest discover -s . -p '*_unittest.py'`

Change-Id: I0856c8f854dc2cbd0f2f21b71db96d3ef000caa8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/3248929
Tested-by: Ryan Beltran <ryanbeltran@chromium.org>
Auto-Submit: Ryan Beltran <ryanbeltran@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
5 files changed