feat(ff-a): Implement FFA_MEM_PERM_GET/SET

This patch implements the new ABI from the FF-A v1.1 Beta0 spec. These
ABIs are expected to be used by S-EL0 use cases such as StandaloneMM or
other S-EL0 applications such as trusted firmware services or any other
S-EL0 FF-A partition.

Signed-off-by: Raghu Krishnamurthy <raghu.ncstate@gmail.com>
Change-Id: I6a57420ce5821993671362280a66c5c4f190ffbc
diff --git a/src/arch/fake/hypervisor/ffa.c b/src/arch/fake/hypervisor/ffa.c
index 5dbdc34..a5d8536 100644
--- a/src/arch/fake/hypervisor/ffa.c
+++ b/src/arch/fake/hypervisor/ffa.c
@@ -216,3 +216,15 @@
 
 	return false;
 }
+
+bool plat_ffa_is_mem_perm_get_valid(const struct vcpu *current)
+{
+	(void)current;
+	return false;
+}
+
+bool plat_ffa_is_mem_perm_set_valid(const struct vcpu *current)
+{
+	(void)current;
+	return false;
+}