lisa.trace: Add ipi_entry/ipi_exit event desc
lisa.trace: Add ipi_entry/ipi_exit event desc

Since it's using a const char* field, raw format does not work as it
will display a string pointer rather than the actual string.

credp/lisa,credp/lisa,credp/lisa,ARM-software/lisa,ARM-software/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa