Platform: Fix build for Musca-B1 when SE is used

Add dummy implementations to allow SSE-200 build, when
FORWARD_PROT_MSG is enabled (Musca-B1 SSE-200 with SE).

Change-Id: I1578997cee7b15838737e01b7cb09728144384c5
Signed-off-by: Gabor Abonyi <gabor.abonyi@arm.com>
5 files changed