SPM: Rename spm_ipc.h to spm.h

This file is also used in SFN backend.

Signed-off-by: Sherry Zhang <sherry.zhang2@arm.com>
Change-Id: I4818edfbca3b84414db4ac5d7d8293f0e0c41276
diff --git a/secure_fw/spm/ffm/backend_ipc.c b/secure_fw/spm/ffm/backend_ipc.c
index 673b980..b712b5c 100644
--- a/secure_fw/spm/ffm/backend_ipc.c
+++ b/secure_fw/spm/ffm/backend_ipc.c
@@ -15,7 +15,7 @@
 #include "config_spm.h"
 #include "runtime_defs.h"
 #include "ffm/stack_watermark.h"
-#include "spm_ipc.h"
+#include "spm.h"
 #include "tfm_hal_memory_symbols.h"
 #include "tfm_hal_isolation.h"
 #include "tfm_hal_platform.h"