Add packages/apps/RetailDemo.

Bug: 36510340
Change-Id: I6559154a2ffc8e1da2c789b511e911188e177a0d
(cherry picked from commit 21112fde6f2175060fc671bee7462b0658e8e952)

default.xml

@@ -447,7 +447,8 @@
   <project path="packages/apps/Protips" name="platform/packages/apps/Protips" groups="pdk-fs" />
   <project path="packages/apps/Provision" name="platform/packages/apps/Provision" groups="pdk-fs" />
   <project path="packages/apps/QuickSearchBox" name="platform/packages/apps/QuickSearchBox" groups="pdk-fs" />
-  <project path="packages/apps/SafetyRegulatoryInfo" name="platform/packages/apps/SafetyRegulatoryInfo" />
+  <project path="packages/apps/RetailDemo" name="platform/packages/apps/RetailDemo" groups="pdk-fs" />
+  <project path="packages/apps/SafetyRegulatoryInfo" name="platform/packages/apps/SafetyRegulatoryInfo" groups="pdk-fs" />
   <project path="packages/apps/Settings" name="platform/packages/apps/Settings" groups="pdk-fs" />
   <project path="packages/apps/SoundRecorder" name="platform/packages/apps/SoundRecorder" groups="pdk-fs" />
   <project path="packages/apps/SpareParts" name="platform/packages/apps/SpareParts" groups="pdk-fs" />