Revert "perf util: Make util its own library"

JIRA: https://issues.redhat.com/browse/RHEL-65742


Upstream Status: RHEL-only

This reverts commit b04cbd70.

Conflicts:
==========
Revert is not straightforward, because the following backported patches
changed the context:
  ea59b70a8418 ("perf bpf: Move BPF disassembly routines to separate file to avoid clash with capstone bpf headers")
  564e5cbcfdf5 ("perf tool: Move fill defaults into tool.c")
  8db5cabcf1b6 ("perf stat: Fork and launch 'perf record' when 'perf stat' needs to get retire latency value for a metric.")
  c3f8644c21df ("perf report: Support LLVM for addr2line()")
Thus we need to adjust the changes manually.

Signed-off-by: Michael Petlan <mpetlan@redhat.com>