feat(trbe): add trace buffer control registers access test

Added a test to read trace buffer control registers to ensure that
EL3 is giving permission to non-secure EL2 to access these registers.

Change-Id: I70faa5bb7e0bc648fbc3d14cb9c1b8da3470a201
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
7 files changed