Documentation: devicetree: arm: cpus/cpu nodes bindings updates

In order to extend the current cpu nodes bindings to newer CPUs
inclusive of AArch64 and to update support for older ARM CPUs this
patch updates device tree documentation for the cpu nodes bindings.

Main changes:
    - adds 64-bit bindings
    - define usage of #address-cells
    - defines behaviour on pre and post v7 uniprocessor systems
    - adds ARM 11MPcore specific reg property definition

Change-Id: I094f2a393121bdaf5160829331ec3c9ad0994c04
Git-commit: 594f88d19d751bd7a8eb967772922aae1e9de845
Git-Repo: git://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/


Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>