Test: Correct delay function for FP interrupt test

Use osDelay instead of osDelayUntil, for osDelayUntil waits until
specified time which is not suitable for FP interrupt test.

Signed-off-by: Feder Liang <feder.liang@arm.com>
Change-Id: I6c96d17107a078963d952b397c9372118636f7f5
5 files changed