Merge branch 'jh/trace2-missing-def-param-fix'

Some trace2 events that lacked def_param have learned to show it, enriching the output. Reviewed-by: Josh Steadmon <steadmon@google.com> cf. <ZejkVOVQBZhLVfHW@google.com> * jh/trace2-missing-def-param-fix: trace2: emit 'def_param' set with 'cmd_name' event trace2: avoid emitting 'def_param' set more than once t0211: demonstrate missing 'def_param' events for certain commands