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

@@ -286,9 +286,17 @@
 
 #else /* portUSING_MPU_WRAPPERS */
 
+    #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

@@ -1 +1 @@
-Subproject commit abc22103e1e6634b33457d4127bff1ab62f27f90
+Subproject commit fccbbce9bd7e227ee211b01fdbbcf133dc3a474a