dt-bindings: sram: qcom,ocmem: cleanup example coding style

Fix the indentation in the OCMEM example and use generic node name -
sram - to reflect the type of the device.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220607171848.535128-1-krzysztof.kozlowski@linaro.org