perf build: Fix fsmount.o build

perf build: Fix fsmount.o build

A merge conflict between:

commit 552636b9317c8a84 ("perf trace: Add beautifier script for fsmount flags")
commit 32969ef6e3e1979a ("perf build: Pre-generate BPF skeleton tooling during umbrella prepare phase")

Resulted in a missed build dependency in the linux-next merge:

commit 61da860eee0798d3 ("Merge branch 'perf-tools-next' of https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git")

Fix the build by adding the necessary build dependencies.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>