FTL: Extend enum utilities imported from IF

Generalize compile-time and run-time lookup of enumerator names by
recognizing ftl_first and ftl_last to customize the range.

Add enum_range<E>() for iteration using range-based `for` loop.

Bug: 185536303
Test: Check assembly for small LUT in .rodata, and unrolled loops.
Test: ftl_test, libinput_tests, inputflinger_tests
Test: m libinputflinger
Change-Id: I0581611f4cfcf5837b0293867cb323742afb2c87
diff --git a/services/inputflinger/dispatcher/Entry.h b/services/inputflinger/dispatcher/Entry.h
index 547021c..5365a78 100644
--- a/services/inputflinger/dispatcher/Entry.h
+++ b/services/inputflinger/dispatcher/Entry.h
@@ -40,6 +40,8 @@
         POINTER_CAPTURE_CHANGED,
         DRAG,
         TOUCH_MODE_CHANGED,
+
+        ftl_last = TOUCH_MODE_CHANGED
     };
 
     int32_t id;