Disable host libinput shared library

This doesn't compile on Mac, and we weren't building it in Make. So just
disable the shared host library.

Change-Id: Ia678cf0c66474f08dce0f8dae1444744789ffbc8
diff --git a/libs/input/Android.bp b/libs/input/Android.bp
index 4c98cd3..28df1cf 100644
--- a/libs/input/Android.bp
+++ b/libs/input/Android.bp
@@ -51,5 +51,10 @@
                 "libbinder",
             ],
         },
+        host: {
+            shared: {
+                enabled: false,
+            },
+        },
     },
 }