Core: Move spm header files to 'spm' folder

- Move 'spm_xxx.h' to 'spm' folder, they should belong to 'spm'.
- Fix and simplify inclusion of header file.
- Fix format and typo error.

Change-Id: I129c6626ddffbbdba0e7edc27e9307f0d6ea9b79
Signed-off-by: Mingyang Sun <mingyang.sun@arm.com>
diff --git a/secure_fw/spm/model_ipc/tfm_rpc.c b/secure_fw/spm/model_ipc/tfm_rpc.c
index 073e4f4..f2778aa 100644
--- a/secure_fw/spm/model_ipc/tfm_rpc.c
+++ b/secure_fw/spm/model_ipc/tfm_rpc.c
@@ -5,7 +5,7 @@
  *
  */
 
-#include "tfm/spm_api.h"
+#include "spm_api.h"
 #include "spm_psa_client_call.h"
 #include "tfm_rpc.h"
 #include "tfm_utils.h"