simpleperf: add --kprobe option to record cmd.

It adds temporary kprobe events during recording. The format of
kprobe events follows Documentation/trace/kprobetrace.rst in the kernel.

Also fix an error in event_type.cpp.

Bug: 160630060
Test: run simpleperf_unit_test.
Change-Id: Ib0c46a76e8d5900fd5df2f978763743a230b075d
13 files changed