dt-bindings: cpufreq: Drop redundant Mediatek binding

dt-bindings: cpufreq: Drop redundant Mediatek binding

The Mediatek CPUFreq binding document just describes properties from
the CPU node which the driver uses. This is redundant as all the
properties are described in the arm/cpus.yaml schema.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://lore.kernel.org/r/20250410-dt-cpu-schema-v2-17-63d7dc9ddd0a@kernel.org