Test: Trigger secure tests in SPE in IPC model

This patch enables TF-M SPE to start secure test cases in IPC model
without the routine from NS to Secure Client Service.

Signed-off-by: Jianliang Shen <jianliang.shen@arm.com>
Change-Id: I4581d3e68df48ffa23c440139c90b92576621727
8 files changed