cxd56 was not using SRC_SHARED_MODULE_INTERNAL

Author: dhalbert

ports/cxd56/Makefile

@@ -134,7 +134,8 @@ SRC_COMMON_HAL_EXPANDED = $(addprefix shared-bindings/, $(SRC_COMMON_HAL)) \
                           $(addprefix common-hal/, $(SRC_COMMON_HAL))
 
 SRC_SHARED_MODULE_EXPANDED = $(addprefix shared-bindings/, $(SRC_SHARED_MODULE)) \
-                             $(addprefix shared-module/, $(SRC_SHARED_MODULE))
+                             $(addprefix shared-module/, $(SRC_SHARED_MODULE)) \
+                             $(addprefix shared-module/, $(SRC_SHARED_MODULE_INTERNAL))
 
 SRC_S = supervisor/cpu.s