vdso: aarch64 -- Merge fixes from x86
vdso: aarch64 -- Merge fixes from x86

This brings the changes made in the following commits to the
aarch64 copy of the code.

commit 7794f67f2055420c6b6c2967edfbe0c39a7cd744
Author: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>
Date:   Tue Aug 5 13:59:18 2014 +0400

    vdso: x86 -- Fix missing ability to remap vDSO if only one zone present

commit 066add0de44f462e7482571763f303ded0b4762f
Author: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>
Date:   Tue Aug 5 13:07:00 2014 +0400

    vdso: x86 -- Simplify vdso_proxify

Signed-off-by: Christopher Covington <a4bb60c1cee4bc57e495283536ad4f6d94bfb161@codeaurora.org>
Acked-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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