Proxy: Don't include platform_multicore.h

There are two versions of platform_multicore.h in the TF-M
source, both under platform/ext/target/... Partition code
should not be including header files from the platform directory
except where such header files are part of the platform API
(such as region_defs.h).

It seems in this case that the code doesn't actually need the #include,
so just remove it.

Signed-off-by: Chris Brand <chris.brand@cypress.com>
Change-Id: Ib651587fe4ec08e3850fab56f27e111c81b8964b
diff --git a/secure_fw/partitions/psa_proxy/psa_proxy.c b/secure_fw/partitions/psa_proxy/psa_proxy.c
index 7317650..bbe49d1 100644
--- a/secure_fw/partitions/psa_proxy/psa_proxy.c
+++ b/secure_fw/partitions/psa_proxy/psa_proxy.c
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2020-2021, Arm Limited. All rights reserved.
+ * Copyright (c) 2021, Cypress Semiconductor Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  *
@@ -13,7 +14,6 @@
 #include "psa_manifest/sid.h"
 #include "tfm_multi_core_api.h"
 #include "tfm_ns_mailbox.h"
-#include "platform_multicore.h"
 #include "psa_proxy_shared_mem_mngr.h"
 
 #define NON_SECURE_CLIENT_ID            (-1)
diff --git a/secure_fw/partitions/psa_proxy/psa_proxy_shared_mem_mngr.c b/secure_fw/partitions/psa_proxy/psa_proxy_shared_mem_mngr.c
index dc5614e..68eeee8 100644
--- a/secure_fw/partitions/psa_proxy/psa_proxy_shared_mem_mngr.c
+++ b/secure_fw/partitions/psa_proxy/psa_proxy_shared_mem_mngr.c
@@ -1,12 +1,12 @@
 /*
  * Copyright (c) 2020, Arm Limited. All rights reserved.
+ * Copyright (c) 2021, Cypress Semiconductor Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  *
  */
 
 #include "psa_proxy_shared_mem_mngr.h"
-#include "platform_multicore.h"
 #include "region_defs.h"
 #include "psa/service.h"
 #ifdef PSA_PROXY_ADDR_TRANSLATION