Revert "[Android] Allow __NR_process_vm_readv under Seccomp."

This reverts commit 7844944fc6377795aaa2f9087bd4a285482ec4c3.

Reason for revert: it broke x86 builder
https://build.chromium.org/p/chromium.android/builders/Android%20x86%20Builder%20%28dbg%29/builds/22715

Original change's description:
> [Android] Allow __NR_process_vm_readv under Seccomp.
> 
> Bug: 766245
> Change-Id: Ic494f526c1b8d15483ca7e9a97d9f044f276c26d
> Reviewed-on: https://chromium-review.googlesource.com/671556
> Reviewed-by: Richard Coles <torne@chromium.org>
> Commit-Queue: Robert Sesek <rsesek@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#502714}

TBR=torne@chromium.org,rsesek@chromium.org

Change-Id: I31ab91b3572c1e109699ceabcdfbd06cc0c54e39
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 766245
Reviewed-on: https://chromium-review.googlesource.com/671658
Reviewed-by: Tao Bai <michaelbai@chromium.org>
Commit-Queue: Tao Bai <michaelbai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502723}

• sandbox/linux/seccomp-bpf-helpers/baseline_policy_android.cc[diff]