arm64: uaccess: Mask __user pointers for __arch_{clear, copy_*}_user

arm64: uaccess: Mask __user pointers for __arch_{clear, copy_*}_user

BugLink: http://bugs.launchpad.net/bugs/1751064
Commit f71c2ffcb20d upstream.

Like we've done for get_user and put_user, ensure that user pointers
are masked before invoking the underlying __arch_{clear,copy_*}_user
operations.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>