bcc/python: Add x86 and sw test to test_attach_perf_event.py
bcc/python: Add x86 and sw test to test_attach_perf_event.py

Since the current test can't run on github actions since there's no HW
perf counter access, add a test using software page faults perf
event, which might work.

Also, rename the current HW test in there to highlight that it'll work
for PowerPC, and add a similar test for x86.

brendangregg/bcc,iovisor/bcc,iovisor/bcc,brendangregg/bcc,brendangregg/bcc,iovisor/bcc,iovisor/bcc,iovisor/bcc,brendangregg/bcc,brendangregg/bcc