Add MPU wrapper macro for moving PRIVILEGED_DATA

- User can define portMOVE_PRIVILEGED_DATA as a section
  attribute to move the PRIVILEGED_DATA section arbitrarily.
- 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.

Signed-off-by: Ian Thompson <ianst@cadence.com>

Author: ianstcdns

include/mpu_wrappers.h

@@ -280,6 +280,12 @@
     #define PRIVILEGED_DATA         __attribute__( ( section( "privileged_data" ) ) )
     #define FREERTOS_SYSTEM_CALL    __attribute__( ( section( "freertos_system_calls" ) ) )
 
+#elif ( defined portMOVE_PRIVILEGED_DATA )
+
+    #define PRIVILEGED_FUNCTION
+    #define PRIVILEGED_DATA         portMOVE_PRIVILEGED_DATA
+    #define FREERTOS_SYSTEM_CALL
+
 #else /* portUSING_MPU_WRAPPERS */
 
     #define PRIVILEGED_FUNCTION