Add a new keycode for TV (ALL_APPS)

    - KEYCODE_ALL_APPS: Launches all apps. For TV, this checks for
      launcher package in system image.

Test: Manual: ALL_APPS: adb shell input keyevent 284
Test: also tested with --longpress for these keys

Bug: 38496261
Change-Id: I2e50a569533f01d93c020adde672c842540f0193
diff --git a/include/input/InputEventLabels.h b/include/input/InputEventLabels.h
index 20154eb..c282cf0 100644
--- a/include/input/InputEventLabels.h
+++ b/include/input/InputEventLabels.h
@@ -323,6 +323,7 @@
     DEFINE_KEYCODE(SYSTEM_NAVIGATION_DOWN),
     DEFINE_KEYCODE(SYSTEM_NAVIGATION_LEFT),
     DEFINE_KEYCODE(SYSTEM_NAVIGATION_RIGHT),
+    DEFINE_KEYCODE(ALL_APPS),
 
     { NULL, 0 }
 };