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/runtime/spm_api.c b/secure_fw/spm/runtime/spm_api.c
index 5ff1dc3..22db2ec 100644
--- a/secure_fw/spm/runtime/spm_api.c
+++ b/secure_fw/spm/runtime/spm_api.c
@@ -7,8 +7,8 @@
 
 /* All the APIs defined in this file are common for library and IPC model. */
 
-#include "tfm/spm_api.h"
-#include "tfm/spm_db.h"
+#include "spm_api.h"
+#include "spm_db.h"
 
 /* Extern SPM variable */
 extern struct spm_partition_db_t g_spm_partition_db;