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This essentially reverts commit c72e3f04 ("tools/perf/build:
Speed up git-version test on re-make") and commit 4e666cdb
("perf tools: Fix dependency for version file creation")

In commit c72e3f04 ("tools/perf/build: Speed up git-version test
on re-make"), a makefile dependency on .git/HEAD was added. The
background is that running PERF-VERSION-FILE is relatively slow, and
commands like "git describe" are particularly slow.

In commit 4e666cdb ("perf tools: Fix dependency for version file
creation"), an additional dependency on .git/ORIG_HEAD was added, as
.git/HEAD may not change for "git reset --hard HEAD^" command. However,
depending on whether we're on a branch or not, a "git cherry-pick" may
not lead to the version being updated.

As discussed with the git community in [0], using git internal files for
dependencies is not reliable. Commit 4e666cdb also breaks some build
scenarios [1].

As menti...