RSE: Set ATU window to device memory in runtime

Following the MPU configuration in BL1_1 and BL1_2 to set the ATU
mapping region as device memory, do the same in runtime. This is
required as the runtime completely reconfigures the MPU and therefore
the existing region will be removed.

Change-Id: I3a52455061d23fa1b2d8d886122b67678501e880
Signed-off-by: Jackson Cooper-Driver <jackson.cooper-driver@arm.com>

Author: jaccoo01

platform/ext/target/arm/rse/common/tfm_peripherals_def.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019-2024, Arm Limited. All rights reserved.
+ * SPDX-FileCopyrightText: Copyright The TrustedFirmware-M Contributors
  * Copyright (c) 2020-2023 Cypress Semiconductor Corporation (an Infineon company)
  * or an affiliate of Cypress Semiconductor Corporation. All rights reserved.
  *
@@ -95,6 +95,18 @@ extern struct platform_data_t tfm_peripheral_dma0_ch0;
         ARM_MPU_RLAR_PXN(DTCM_BASE_S + DTCM_SIZE - 1, \
                          ARM_MPU_PRIVILEGE_EXECUTE_NEVER, \
                          0), \
+    }, \
+    /* Mark ATU RSE mapping region as device memory to prevent */ \
+    /* the CPU caching accesses to system memory map */ \
+    { \
+        ARM_MPU_RBAR(HOST_ACCESS_BASE_NS, \
+                     ARM_MPU_SH_NON, \
+                     ARM_MPU_READ_WRITE, \
+                     ARM_MPU_UNPRIVILEGED, \
+                     ARM_MPU_EXECUTE_NEVER), \
+        ARM_MPU_RLAR_PXN(HOST_ACCESS_LIMIT_S, \
+                         ARM_MPU_PRIVILEGE_EXECUTE_NEVER, \
+                         2 /* Device memory attribute */), \
     },
 
 #ifdef __cplusplus