Exempt Android Auto from background FGS restriction.

From the background FGS while-in-use permission restriction.

Bug: 149835015, 136219221
Test: adb shell dumpsys activity -a.
Change-Id: I08c9e5fd2e2c304afe02430c6c7e7db0eb3c383d

services/core/java/com/android/server/am/ActiveServices.java

@@ -408,6 +408,9 @@ public final class ActiveServices {
         if (!TextUtils.isEmpty(systemCaptionsServicePackageName)) {
             mWhiteListAllowWhileInUsePermissionInFgs.add(systemCaptionsServicePackageName);
         }
+        // TODO change this to configurable in config.xml.
+        final String projectionPackage = "com.google.android.projection.gearhead";
+        mWhiteListAllowWhileInUsePermissionInFgs.add(projectionPackage);
     }
 
     ServiceRecord getServiceByNameLocked(ComponentName name, int callingUser) {