Allow the radio to be specified as a standalone file.

This replicates the bootloader setup.

Bug: 4295425
Bug: 7252211
Change-Id: I7f7ff157fab98f67a9e143019870d64fffd5b2f1
diff --git a/clear-factory-images-variables.sh b/clear-factory-images-variables.sh
index df9c251..a92586a 100644
--- a/clear-factory-images-variables.sh
+++ b/clear-factory-images-variables.sh
@@ -24,6 +24,7 @@
 unset ERASE
 unset PRODUCT
 unset RADIO
+unset RADIOFILE
 unset RADIOSRC
 unset SLEEPDURATION
 unset SRCPREFIX