Remove unused toolchains from manifest

Change-Id: Ie36ae52980a661cf59fdb69862e150116d92b3e4
diff --git a/default.xml b/default.xml
index 2fb9b2b..e826e01 100644
--- a/default.xml
+++ b/default.xml
@@ -55,12 +55,6 @@
     <project name="imx-test" path="imx-test"
       groups="notdefault,imx"/>
 
-    <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"
       groups="notdefault,imx"/>