dt-bindings: ARM: sunxi: Document A80 SoC secure SRAM usage by SMP hotplug

On the Allwinner A80 SoC the BROM supports hotplugging the primary core
(cpu0) by checking two 32bit values at a specific location within the
secure SRAM block. This region needs to be reserved and accessible to
the SMP code.

Document its usage.

Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

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