Use sysprop APIs for InputFlinger: per_window_input_rotation

Add a sysprop file for InputFlinger, and add a sysprop entry for the
per_window_input_rotation flag.

Bug: 179274888
Test: build
Change-Id: Id11f72f7774e2b04a9817ac5807808ccbd33fb28
diff --git a/services/inputflinger/reader/Android.bp b/services/inputflinger/reader/Android.bp
index 7db32e3..ee7b392 100644
--- a/services/inputflinger/reader/Android.bp
+++ b/services/inputflinger/reader/Android.bp
@@ -71,6 +71,7 @@
         "libstatslog",
         "libui",
         "libutils",
+        "InputFlingerProperties",
     ],
     static_libs: [
         "libc++fs",