selftests/ftrace: Add synthetic event field separators

These tests omit field separators from the synthetic event definitions
so don't follow the syntax '<event_name> field[;field] ...' required
for synthetic events.

Fixes: f06eec4d0f2c (selftests: ftrace: Add inter-event hist triggers testcases)
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
4 files changed