Link .clang-format to the standard .clang-format file (4-space-indent
version) from build/soong, rather than use a custom file.
Among other changes, the standard file has the "IncludeBlocks: Preserve"
setting, so include blocks stay in order.
Don't actually reformat all the code yet.
Test: Tried 'clang-format -i $(find . -name \*.cpp -o -name \*.h)'
and checked that the changes look sane.
Change-Id: I11ecbd03b31e44ba7b3e01175a6fc317f8173ab0
These are the same rules used by system/core/. We'll apply it to
existing code in a future CL.
Test: none
Bug: 67041047
Change-Id: I407581a9ba155aea87ac87f231f5269f7c444a2e
