Revert "bliss: Use prebuilt repo tool for Changelog generation"

This reverts commit 9a3a44c2ddfb94abcef44c915e1f7496be7c2c23.s

Change-Id: I5e446ef95307c13e81e04872955809a614e8ef7a
diff --git a/tools/changelog b/tools/changelog
index 38ab837..d6f2612 100755
--- a/tools/changelog
+++ b/tools/changelog
@@ -28,7 +28,7 @@
 	echo >> $Changelog;
 
 	# Cycle through every repo to find commits between 2 dates
-	prebuilts/tools-bliss/linux-x86/bin/repo forall -pc 'git log --oneline --after=$After_Date --until=$Until_Date' >> $Changelog
+	repo forall -pc 'git log --oneline --after=$After_Date --until=$Until_Date' >> $Changelog
 	echo >> $Changelog;
 done