message: Fix the field used to calculate SP_DeviceMemoryBase struct size.
diff: @@ -148,7 +148,7 @@ typedef struct SP_DeviceMemoryBase {
  } SP_DeviceMemoryBase;
  #define SP_DEVICE_MEMORY_BASE_STRUCT_SIZE \
  - TF_OFFSET_OF_END(SP_DeviceMemoryBase, size)
  + TF_OFFSET_OF_END(SP_DeviceMemoryBase, payload)
  typedef struct SP_Device {
  size_t struct_size;
  