simpleperf: accept failures when getting hw counters on a cpu.

When built as a 32-bit program, simpleperf can't set sched_affinity
to a 64-bit only CPU. That can make simpleperf not be able to get
hardware counters on that CPU.

Bug: 243065368
Bug: 243479304
Test: run simpleperf_unit_test
Change-Id: I0eb2841e191e88a96eeae53ec95b265db194cfd8
(cherry picked from commit 5aded99e9925531836b0e2b511b1448b4d64785e)
2 files changed