Since PSA is always on in 4.x, *_PSA_INIT() and *_PSA_DONE() can be
simply aliased to PSA_INIT() and PSA_DONE() until such a time as we
remove them.
Simplify the login of these PSA_INIT/DONE variants by aliasing them in
4.x and keeping the more complex 3.6 logic entirely separate.
Signed-off-by: David Horstmann <david.horstmann@arm.com>