Introduce isTv to adapt services to Android TV uses

This variable is intended to be used as part of the startOtherServices
method of the system server much like `isWatch` is used now in order
to selectively skip starting system services, which are not relevant to
the operation of Android TV.

Test: make
Bug: 264411203
Change-Id: Ife21ac60e11d6669954dc0f77b2c85d0149d2d7b

services/java/com/android/server/SystemServer.java

@@ -1446,6 +1446,9 @@ public final class SystemServer implements Dumpable {
         boolean isArc = context.getPackageManager().hasSystemFeature(
                 "org.chromium.arc");
 
+        boolean isTv = context.getPackageManager().hasSystemFeature(
+                PackageManager.FEATURE_LEANBACK);
+
         boolean enableVrService = context.getPackageManager().hasSystemFeature(
                 PackageManager.FEATURE_VR_MODE_HIGH_PERFORMANCE);