Merge remote-tracking branch 'tforg/master' into tfa-next

Pull the latest changes from the master branch, whose tip right now is
at commit 0e2a5290a32a2aa8955e22879f29628bddc8d95e "feat(handoff): add
aarch32 + fw handoff tests".

Change-Id: I5dc10ccebc8dc68f3f21f77ccf57354c563bf88d
Signed-off-by: Sandrine Afsa <sandrine.afsa@arm.com>