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/platform/ext/common/tfm_interrupts.c b/platform/ext/common/tfm_interrupts.c
index b469abb..640696c 100644
--- a/platform/ext/common/tfm_interrupts.c
+++ b/platform/ext/common/tfm_interrupts.c
@@ -11,7 +11,7 @@
 #include <stdint.h>
 
 #include "cmsis.h"
-#include "spm_ipc.h"
+#include "spm.h"
 #include "tfm_hal_interrupt.h"
 #include "tfm_peripherals_def.h"
 #include "ffm/interrupt.h"