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/crypto/tfm_mbedcrypto_include.h b/secure_fw/services/crypto/tfm_mbedcrypto_include.h
index b04b180..20f030d 100644
--- a/secure_fw/services/crypto/tfm_mbedcrypto_include.h
+++ b/secure_fw/services/crypto/tfm_mbedcrypto_include.h
@@ -9,7 +9,7 @@
 #define __TFM_MBEDCRYPTO_INCLUDE_H__
 
 /* FIXME: The PSA Crypto headers in Mbed Crypto define PSA_SUCCESS and typedef
- * psa_status_t. To prevent redefinition errors in psa_client.h, use the
+ * psa_status_t. To prevent redefinition errors in psa/client.h, use the
  * preprocessor to prefix psa_status_t in the Mbed Crypto headers, and then
  * undef psa_status_t and PSA_SUCCESS after the include.
  */