Disable LTO temporarily for hwui

Bug: http://b/62839002

LTO does not seem to interact well with PGO profile-file updates and
incremental builds in the build servers.

Test: build
Change-Id: I42175b2376b374d00ec169d4fe8d84cd938b21e5

libs/hwui/Android.bp

@@ -6,7 +6,10 @@ cc_defaults {
         //"hwui_bugreport_font_cache_usage",
         //"hwui_compile_for_perf",
         "hwui_pgo",
-        "hwui_lto",
+        // Disable LTO temporarily.  LTO does not seem to interact well with
+        // PGO profile-file updates and incremental builds in the build
+        // servers.
+        // "hwui_lto",
     ],
 
     cpp_std: "c++17",