manifest: update to r22

Change-Id: I70cd4c69db1befdfa3bc6b87e6afd19b8635791c
diff --git a/default.xml b/default.xml
index fa14422..8031700 100644
--- a/default.xml
+++ b/default.xml
@@ -21,7 +21,7 @@
   <remote  name="private"
            fetch="ssh://git@github.com" />
 
-  <default revision="refs/tags/android-6.0.1_r16"
+  <default revision="refs/tags/android-6.0.1_r22"
            remote="aosp"
            sync-j="4" />
 
@@ -406,7 +406,6 @@
   <project path="packages/apps/Dialer" name="platform/packages/apps/Dialer" groups="pdk-fs" />
   <project path="packages/apps/Email" name="platform/packages/apps/Email" groups="pdk-fs" />
   <project path="packages/apps/ExactCalculator" name="platform/packages/apps/ExactCalculator" groups="pdk-fs" />
-  <project path="packages/apps/Exchange" name="platform/packages/apps/Exchange" groups="pdk-fs" />
   <project path="packages/apps/FMRadio" name="platform/packages/apps/FMRadio" groups="pdk-fs" />
   <project path="packages/apps/Gallery" name="platform/packages/apps/Gallery" groups="pdk-fs" />
   <project path="packages/apps/Gallery2" name="platform/packages/apps/Gallery2" groups="pdk-fs" />