Remove app switch behaviour

This behaviour is no longer relevant and poorly documented. It is also untested.
Introduce a flag to remove it.

Bug: 284808102
Test: TEST=inputflinger_tests; m $TEST && $ANDROID_HOST_OUT/nativetest64/$TEST/$TEST
Change-Id: I303fbbb76e8b21f2d4657ae24e39e38d07bcd817
diff --git a/libs/input/input_flags.aconfig b/libs/input/input_flags.aconfig
index 978a80f..f6c5e0d 100644
--- a/libs/input/input_flags.aconfig
+++ b/libs/input/input_flags.aconfig
@@ -48,3 +48,10 @@
   description: "Enable additional palm rejection on touchpad while typing"
   bug: "301055381"
 }
+
+flag {
+  name: "remove_app_switch_drops"
+  namespace: "input"
+  description: "Remove the logic of dropping events due to pending app switch"
+  bug: "284808102"
+}