Revert "Add option to remove GUARD partition on PNOR update"

This reverts commit a37602b74e10ec58f3f7d68f7f9f010ddf673187.

Change-Id: I806844de4145933fb67e146491f761b6465e8dc0
diff --git a/lib/resource.txt b/lib/resource.txt
index 45049bc..8f00efb 100755
--- a/lib/resource.txt
+++ b/lib/resource.txt
@@ -57,10 +57,9 @@
 ${BMC_IMAGE_FILE_PATH}          ${EMPTY}
 ${BAD_IMAGES_DIR_PATH}          ${EMPTY}
 
-# The caller must set this to the string "true" in order to delete images or
-# the GUARD file. The code is picky.
+# The caller must set this to the string "true" in order to delete images. The
+# code is picky.
 ${DELETE_OLD_PNOR_IMAGES}   false
-${DELETE_OLD_GUARD_FILE}    true
 
 # Caller can specify a value for LAST_KNOWN_GOOD_VERSION to indicate that if
 # the machine already has that version on it, the update should be skipped.