radio files aren't modules, prebuilt or otherwise

Change-Id: Ic21cf9f7d9657819e40c6700c98e61971dab24b4
diff --git a/core/definitions.mk b/core/definitions.mk
index 47c0f9f3..c0a1c2b 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -1802,7 +1802,6 @@
 endef
 define add-radio-file-internal
 INSTALLED_RADIOIMAGE_TARGET += $$(PRODUCT_OUT)/$(2)
-ALL_PREBUILT += $$(PRODUCT_OUT)/$(2)
 $$(PRODUCT_OUT)/$(2) : $$(LOCAL_PATH)/$(1) | $$(ACP)
 	$$(transform-prebuilt-to-target)
 endef