SPCI is now called PSA FF-A.

Change-Id: Iaa10e0449edf5f6493ab21e648219392b17cc5ec
diff --git a/src/vcpu.c b/src/vcpu.c
index b77689d..c98f2ad 100644
--- a/src/vcpu.c
+++ b/src/vcpu.c
@@ -64,7 +64,7 @@
 	vcpu.vcpu->state = VCPU_STATE_READY;
 }
 
-spci_vcpu_index_t vcpu_index(const struct vcpu *vcpu)
+ffa_vcpu_index_t vcpu_index(const struct vcpu *vcpu)
 {
 	size_t index = vcpu - vcpu->vm->vcpus;