Add cm platform sdk repo to manifest.

Change-Id: I589af2629273afa407616a34c72d721cac833d0b
diff --git a/default.xml b/default.xml
index 8226d51..cb001ee 100644
--- a/default.xml
+++ b/default.xml
@@ -587,4 +587,5 @@
   <project path="tools/studio/translation" name="platform/tools/studio/translation" groups="notdefault,tools" remote="aosp" />
   <project path="tools/swt" name="platform/tools/swt" groups="notdefault,tools" remote="aosp" />
   <project path="vendor/cm" name="CyanogenMod/android_vendor_cm" />
+  <project path="vendor/cmsdk" name="CyanogenMod/cm_platform_sdk" />
 </manifest>