feat(cm): add tests to validate EL1 regs during context switch

* This patch adds a test to verify the integrity of the el1_context
  registers across world-switch.

* It aims at testing the save and restore functionality provided
  by the EL3 context management library.

* It validates the EL1 ctx register entries after interaction with
  TSP (S-EL1) software.

Change-Id: Id435d9d7699231d66e9e7acdbb3459ec439d2aef
Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
7 files changed