Interface: Rename PSA headers

Renames PSA headers from psa_<api>.h to psa/<api>.h.

Change-Id: I3fc552c39f9a7e6d54e7a7a2f82f076bd03d30a7
Signed-off-by: Jamie Fox <jamie.fox@arm.com>
diff --git a/secure_fw/services/initial_attestation/attestation.h b/secure_fw/services/initial_attestation/attestation.h
index f73ed0f..6a2fe0c 100644
--- a/secure_fw/services/initial_attestation/attestation.h
+++ b/secure_fw/services/initial_attestation/attestation.h
@@ -8,7 +8,7 @@
 #ifndef __ATTESTATION_H__
 #define __ATTESTATION_H__
 
-#include "psa_initial_attestation_api.h"
+#include "psa/initial_attestation.h"
 #include "tfm_client.h"
 #include "bl2/include/tfm_boot_status.h"