perf(tftf): reduce the IRQ validation wait

The IRQ validation test waits for half a second before checking that an
interrupt happened and it wasn't handled. This is an eternity for any
reasonable system and waiting that long isn't necessary. Reduce the wait
so that testing is quicker.

Change-Id: I90b2b74815815bac4272df992725a8311c6f373d
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
1 file changed