Revert "arm64: kasan: Revert "arm64: mte: reset the page tag in page->flags""

Revert "arm64: kasan: Revert "arm64: mte: reset the page tag in page->flags""

This reverts commit add4bc9281e8704e5ab15616b429576c84f453a2.

On Mon, Sep 12, 2022 at 10:52:45AM +0100, Catalin Marinas wrote:
>I missed this (holidays) and it looks like it's in stable already. On
>its own it will likely break kasan_hw if used together with user-space
>MTE as this change relies on two previous commits:
>
>70c248aca9e7 ("mm: kasan: Skip unpoisoning of user pages")
>6d05141a3930 ("mm: kasan: Skip page unpoisoning only if __GFP_SKIP_KASAN_UNPOISON")
>
>The reason I did not cc stable is that there are other dependencies in
>this area. The potential issues without the above commits were rather
>theoretical, so take these patches rather as clean-ups/refactoring than
>fixes.

Signed-off-by: Sasha Levin <sashal@kernel.org>