simpleperf: ProtoFileReportLib: fix reporting off-cpu mode

Also report recording file when a trace-offcpu mode isn't supported.

Bug: 325484390
Test: run test/test.py -p TestProtoFileReportLib*
Test: run scripts manually
Change-Id: Ie4e0cda2621e5e9bf7c05137fe15b8625359c2dc
1 file changed