Service: Update the include statements

Change the absolute including into relative including
for partition service sources.

Change-Id: I1cc2057e5965046242a9b70e01e937243cacfc7e
Signed-off-by: Mingyang Sun <mingyang.sun@arm.com>
diff --git a/secure_fw/partitions/initial_attestation/attestation.h b/secure_fw/partitions/initial_attestation/attestation.h
index a7be321..08cbad4 100644
--- a/secure_fw/partitions/initial_attestation/attestation.h
+++ b/secure_fw/partitions/initial_attestation/attestation.h
@@ -10,7 +10,7 @@
 
 #include "psa/initial_attestation.h"
 #include "tfm_client.h"
-#include "bl2/include/tfm_boot_status.h"
+#include "tfm_boot_status.h"
 
 #ifdef __cplusplus
 extern "C" {