ARM: OABI: use scoped user access in epoll_put_uevent()

The generic epoll_put_uevent() writes the two fields of each event
inside scoped_user_write_access_size().  The ARM override, which also
handles the packed OABI layout, still does it with __put_user(), relying
on the access_ok() that ep_check_params() does on the whole array.

Do it the same way as the generic version, for both layouts.  ARM has no
user_access_begin(), so the accesses are the same as before.

This is part of getting rid of __get_user() and __put_user() entirely.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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