Revert "perf: fix x86 build too - tsk"

This reverts commit e80834ecfb9957733c3b0c100d958b4dd69a2a15.
perf tools: Move libdw availability check before arch Makefile

Since NO_DWARF is used in arch/$(ARCH)/Makefiles, it should be checked
before including those files.  It was moved by mistake during libelf
dependency removal work by me, sorry.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>