refactor(measured boot): rename add_event2()

To a layman in TCG linguo, add_event2() is not straight forward to
understand. Rename the function into event_log_record().

Change-Id: I75d53a656425cd78a41ebf2c4c4e4e57687adc0d
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
1 file changed