Put a copy of the radio/bootloader files in the dist dir.

Bug: 10035750
Change-Id: I3b51e61ec737899d9264885a1e66c89a7a740d54
diff --git a/core/definitions.mk b/core/definitions.mk
index 7834baa..06437f7 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -1999,6 +1999,7 @@
 ###########################################################
 ## Define device-specific radio files
 ###########################################################
+INSTALLED_RADIOIMAGE_TARGET :=
 
 # Copy a radio image file to the output location, and add it to
 # INSTALLED_RADIOIMAGE_TARGET.