Crypto: Don't prefix psa/ to header inclusions from main

Reduces the degrees of freedom when including PSA crypto
headers. The PSA Crypto headers are always guaranteed to
be in the same directory of the main psa/crypto.h.

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: I5b2e4400f1cf885d507e3f755602b60051a1b9ab
diff --git a/interface/include/psa/crypto_struct.h b/interface/include/psa/crypto_struct.h
index 50a4cf2..21d4e90 100644
--- a/interface/include/psa/crypto_struct.h
+++ b/interface/include/psa/crypto_struct.h
@@ -121,7 +121,7 @@
  * The server has a different definition of psa_key_attributes_s which
  * maintains more attributes.
  */
-#include "psa/crypto_client_struct.h"
+#include "crypto_client_struct.h"
 struct psa_key_attributes_s {
     struct psa_client_key_attributes_s client;
 };