Move aapt2 Windows binary to 64bit

This will help solving some inconsistencies across platforms in the
shortening of resource namings caused by the different size of size_t.

Bug: 266868960
Test: atest aapt2_tests
Change-Id: Ic161bb4de4c34e8819ec69d024a7bf9ba72b12b9

tools/aapt2/Android.bp

@@ -50,6 +50,7 @@ cc_defaults {
     ],
     target: {
         windows: {
+            compile_multilib: "64",
             enabled: true,
             cflags: ["-Wno-maybe-uninitialized"],
             ldflags: ["-static"],