cpufreq: dt-platdev: Simplify with of_machine_get_match_data()

cpufreq: dt-platdev: Simplify with of_machine_get_match_data()

Replace open-coded getting root OF node, matching against it and getting
the match data with two new helpers: of_machine_get_match_data() and
of_machine_device_match().

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patch.msgid.link/20251112-b4-of-match-matchine-data-v2-2-d46b72003fd6@linaro.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>