[request for stable inclusion]: ARM: 7840/1: LPAE: don't reject mapping /dev/mem above 4GB

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Hi Greg,

Could you please queue following patch to 3.10 stable?

commit 3159f372354e8e1f5dee714663d705dd2c7e0759
    ARM: 7840/1: LPAE: don't reject mapping /dev/mem above 4GB

With LPAE enabled, we want to mapping address space larger than
4GB via /dev/mem. Current 3.10 stable code refuses that.

This patch changes valid address limit from 4GB to real physical
range.

Thank you!

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