Revert "[sandbox] Enable sandboxed pointers on Android"

This reverts commit ae55e4d2.

Reason for revert: blocks Chromium roll: https://ci.chromium.org/ui/p/chromium/builders/try/android-pie-arm64-rel/b8811418393278278849/overview

Original change's description:
> [sandbox] Enable sandboxed pointers on Android
>
> Bug: chromium:1218005
> Change-Id: Ie7c100193848544e661ee62f88be4601426a4e18
> Cq-Include-Trybots: luci.v8.try:v8_linux64_heap_sandbox_dbg_ng,v8_linux_arm64_sim_heap_sandbox_dbg_ng
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3702251
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Commit-Queue: Samuel Groß <saelo@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#81117}

Bug: chromium:1218005
Change-Id: I78c6d44c917e217bfd5ab1ab893e7b417a63a99a
Cq-Include-Trybots: luci.v8.try:v8_linux64_heap_sandbox_dbg_ng,v8_linux_arm64_sim_heap_sandbox_dbg_ng
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3702799
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Owners-Override: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81133}

BUILD.gn

@@ -506,9 +506,9 @@ if (v8_enable_sandbox == "") {
       v8_enable_external_code_space && target_os != "fuchsia"
 }
 
-# Enable sandboxed pointers when the sandbox is enabled.
+# Enable sandboxed pointers on desktop when the sandbox is enabled.
 if (v8_enable_sandbox) {
-  v8_enable_sandboxed_pointers = true
+  v8_enable_sandboxed_pointers = target_os != "android"
 }
 
 # Enable all available sandbox features if sandbox future is enabled.