dt-bindings: sram: Document samsung,exynos850-acpm-sram

Document "samsung,exynos850-acpm-sram" which represents an SRAM region used
for ACPM communication on Samsung-based SoCs.

The SRAM is consumed as a whole, is not split up using child nodes and
properties related to this are not required, that is why "mmio-sram"
compatible can't be used for ACPM purposes because it requires child nodes
to be declared, which are not needed and make no sense in case of ACPM.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Alexey Klimov <alexey.klimov@linaro.org>
Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
Link: https://patch.msgid.link/20260914-exynos850_sram-v4-1-253871de0f61@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

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