linux-hikey: defconfig: Enable ondemand as default governor.
linux-hikey: defconfig: Enable ondemand as default governor.

Currently all 8 cores are set to 1.2ghz in performance mode
which means the SoC on Lemaker board gets very hot.

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

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