Hide pointer while typing on a physical keyboard

In this change we will hide the mouse pointer  while user is typing on a
physical keyboard for a better typing experiance.

Test: Manual test and atest inputflinger_tests
Bug: 275616121
Change-Id: I68192af2769ff0795664ecd2c8d737d69e97e73b
diff --git a/services/inputflinger/tests/Android.bp b/services/inputflinger/tests/Android.bp
index 300bb85..1585fdd 100644
--- a/services/inputflinger/tests/Android.bp
+++ b/services/inputflinger/tests/Android.bp
@@ -62,6 +62,7 @@
         "SyncQueue_test.cpp",
         "TestInputListener.cpp",
         "TouchpadInputMapper_test.cpp",
+        "KeyboardInputMapper_test.cpp",
         "UinputDevice.cpp",
         "UnwantedInteractionBlocker_test.cpp",
     ],