add scripts to analyze kernel I/O trace

- check_verity: requires custom trace in dm-verity
- check_io_trace, check_io_trace_all: requires block trace
- check_file_read: requires ext4 trace with custom trace in do_sys_open

TODO: add kernel patches for custom trace

bug: 31344213
Test: manual trace capture and analysys

Change-Id: Iae57fc017cee6fb4ccc3ea0810eac8a02ea28dbd
4 files changed