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/interface/src/tfm_crypto_api.c b/interface/src/tfm_crypto_api.c
index a4cddbf..19bc52c 100644
--- a/interface/src/tfm_crypto_api.c
+++ b/interface/src/tfm_crypto_api.c
@@ -7,13 +7,13 @@
 
 #include "tfm_veneers.h"
 #include "tfm_crypto_defs.h"
-#include "psa_crypto.h"
+#include "psa/crypto.h"
 #include "tfm_ns_lock.h"
 
 #define ARRAY_SIZE(arr) (sizeof(arr)/sizeof(arr[0]))
 
 #ifdef TFM_PSA_API
-#include "psa_client.h"
+#include "psa/client.h"
 
 /* Macro to check for a valid PSA handle */
 /* FixMe: Here temporarily until it's added to the framework headers */