manifest: bring back DSPManager

we dont want to use the app but the effects part cause
it has more fatures then standard android effects

Change-Id: I5b4d0e381a23a3a84e9cc2da28520cdf88b6fc9e

omni-default.xml

@@ -15,6 +15,7 @@
 
   <project path="vendor/omni" name="android_vendor_omni" remote="omnirom" revision="android-8.0" />
 
+  <project path="packages/apps/DSPManager" name="android_packages_apps_DSPManager" remote="omnirom" revision="android-8.0" />
   <project path="packages/apps/Matlog" name="android_packages_apps_Matlog" remote="omnirom" revision="android-8.0" />
   <project path="packages/apps/MonthCalendarWidget" name="android_packages_apps_MonthCalendarWidget" remote="omnirom" revision="android-8.0" />
   <project path="packages/apps/OmniClock" name="android_packages_apps_OmniClock" remote="omnirom" revision="android-8.0" />