feat(ffa): align manifest to managed exit changes

Managed exit support is moved from messaging method to a dedicated
parameter. As of DEN0077A FF-A v1.1 Beta0 section 5.2, managed exit
support is moved out of messaging-method field and is described in a
separate field.

Signed-off-by: Maksims Svecovs <maksims.svecovs@arm.com>
Change-Id: Id464d6c553d4706d56c9e037d6403d97cd4e1770
2 files changed