Revert "Use arm instruction set with clang 7.0 LTO"

This reverts commit 94574f271fe8730d841a286069c198c6e74fc9e5.
Clang 7.0 LTO shouldn't need arm instruction set,
if we revert one LLVM recent change.

Bug: 72619014
Change-Id: Ic1ee146b823602ae419891f5e0956640109dd397
diff --git a/services/surfaceflinger/layerproto/Android.bp b/services/surfaceflinger/layerproto/Android.bp
index 75612c0..8eb218c 100644
--- a/services/surfaceflinger/layerproto/Android.bp
+++ b/services/surfaceflinger/layerproto/Android.bp
@@ -9,12 +9,6 @@
         "layerstrace.proto",
     ],
 
-    arch: {
-        arm: {
-            instruction_set: "arm",
-        },
-    },
-
     shared_libs: [
         "libui",
         "libprotobuf-cpp-lite",
@@ -39,4 +33,4 @@
         "-Wno-undef",
     ],
 
-}
+}
\ No newline at end of file