Optional PRIVILEGED_DATA wrapper + Partner-Supported-Ports submodule update (#1433)

- Instead, when MPU wrappers are not used, allow port to override
  PRIVILEGED_FUNCTION, PRIVILEGED_DATA, or FREERTOS_SYSTEM_CALL
  selectively, permitting custom section placement at link-time.
- Allows critical data to be placed in port-specific location for
  improved performance, notably for cache-coherent SMP.
- Does not require enabling the full MPU wrappers.

include/mpu_wrappers.h

diff --git a/include/mpu_wrappers.h b/include/mpu_wrappers.h
index ebbd5f9..69e6cbb 100644
--- a/include/mpu_wrappers.h
+++ b/include/mpu_wrappers.h
@@ -286,9 +286,17 @@
 
 #else /* portUSING_MPU_WRAPPERS */
 
-    #define PRIVILEGED_FUNCTION
-    #define PRIVILEGED_DATA
-    #define FREERTOS_SYSTEM_CALL
+    #ifndef PRIVILEGED_FUNCTION
+        #define PRIVILEGED_FUNCTION
+    #endif
+
+    #ifndef PRIVILEGED_DATA
+        #define PRIVILEGED_DATA
+    #endif
+
+    #ifndef FREERTOS_SYSTEM_CALL
+        #define FREERTOS_SYSTEM_CALL
+    #endif
 
 #endif /* portUSING_MPU_WRAPPERS */
 

portable/ThirdParty/Partner-Supported-Ports

diff --git a/portable/ThirdParty/Partner-Supported-Ports b/portable/ThirdParty/Partner-Supported-Ports
index abc2210..fccbbce 160000
--- a/portable/ThirdParty/Partner-Supported-Ports
+++ b/portable/ThirdParty/Partner-Supported-Ports
@@ -1 +1 @@
-Subproject commit abc22103e1e6634b33457d4127bff1ab62f27f90
+Subproject commit fccbbce9bd7e227ee211b01fdbbcf133dc3a474a