Add multiple toolchains to repo manifest.

Change-Id: Ie3a05fe5dd1ae9afcff149ae114e4427a92ccb22
diff --git a/default.xml b/default.xml
index ef2b1a8..c71784c 100644
--- a/default.xml
+++ b/default.xml
@@ -30,7 +30,11 @@
         revision="master" path="modules/apex"
       groups="notdefault,darwinn"/>
 
-    <project path="toolchain" name="toolchain" clone-depth="1" />
+    <project path="toolchains/arm-linux-androideabi"
+      name="arm-linux-androideabi-4.9" clone-depth="1"
+      groups="notdefault,mtk"/>
+    <project path="toolchains/aarch64-linux-android"
+      name="aarch64-linux-android-4.9" clone-depth="1"/>
 
     <project path="tools/bpt" name="bpt" />
     <project path="tools/imx-mkimage" name="imx-mkimage"