Use arm instruction set with clang 7.0 LTO

* surfaceflinger.so uses LTO.
  clang 7.0 LTO inlined more code and some references
  are too far away to use thumb instructions.

Bug: 72619014
Test: run Forrest
Change-Id: Ia09931e93a170ac58007f80da2d580bb9b9635a6
diff --git a/services/surfaceflinger/Android.bp b/services/surfaceflinger/Android.bp
index ae34d34..ae589ca 100644
--- a/services/surfaceflinger/Android.bp
+++ b/services/surfaceflinger/Android.bp
@@ -133,6 +133,11 @@
     srcs: [
         ":libsurfaceflinger_sources",
     ],
+    arch: {
+        arm: {
+            instruction_set: "arm",
+        },
+    },
     logtags: ["EventLog/EventLogTags.logtags"],
     include_dirs: [
         "external/vulkan-validation-layers/libs/vkjson",