simpleperf: loosen unwinding arch check for system wide collection.

When doing system wide collection, it is possible that there are
32-bit compat processes running on 64-bit devices. It is not proper
to abort in this situation. So loosen the check to allow it. Also
add corresponding test.

Bug: 27927427

Change-Id: I5c9253eb6e474497e4f37e234e0e523e141fab20
11 files changed