feat(ff-a): boot information structures

Defining structures for the boot info header and boot info descriptors,
in addition to helper field accessor functions, and helper macros,
aligned with FF-A v1.1 EAC0 specification.

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: I45f7d6aee794a37dd812224c2709f4b09a75a2b6
1 file changed