tools/wltests: set a valid ID for each test

Created by: derkling

Without an ID being explicitely set, WA3 will generate a generic wkNNN lable for each test, where NNN is their position in the agenda file.

Let's set a meaningful name for each workload so that logs and output folders are more easy to read.

Signed-off-by: Patrick Bellasi patrick.bellasi@arm.com