perf test: Fix vmlinux failure on s390x

perf test: Fix vmlinux failure on s390x

On s390x perf test 1 failed. It turned out that commit 4a084ecfc821
("perf report: Fix module symbol adjustment for s390x") was incorrect.
The previous implementation in dso__load_sym() is also suitable for
s390x.

Therefore this patch undoes commit 4a084ecfc821.

Signed-off-by: Thomas-Mich Richter <[email protected]>
Cc: Hendrik Brueckner <[email protected]>
Cc: Zvonko Kosic <[email protected]>
Fixes: 4a084ecfc821 ("perf report: Fix module symbol adjustment for s390x")
LPU-Reference: 20170915071404[email protected]
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>