Add turbine to the AOSP master manifest.

Test: repo sync -j
Bug: b/64148459
Change-Id: Ibd3cce6c251e90a3eef2f5ecfd7f27a127f196ce

default.xml

@@ -314,6 +314,7 @@
   <project path="external/toybox" name="platform/external/toybox" groups="pdk" />
   <project path="external/tpm2" name="platform/external/tpm2" groups="pdk" />
   <project path="external/tremolo" name="platform/external/tremolo" groups="pdk" />
+  <project path="external/turbine" name="platform/external/turbine" groups="pdk" />
   <project path="external/unicode" name="platform/external/unicode" groups="pdk" />
   <project path="external/universal-tween-engine" name="platform/external/universal-tween-engine" />
   <project path="external/v8" name="platform/external/v8" groups="pdk" />