linux-poplar: Update SRCREV to v4.9 SDK based kernel.
linux-poplar: Update SRCREV to v4.9 SDK based kernel.

Update to build to use the feature v4.9 SDK based kernel.

Signed-off-by: Peter Griffin <82f81e62be2bf153f8e7977fe8d5e19723573a1d@linaro.org>

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