clk: mediatek: remove deprecated CLK_INFRA_CA57SEL for MT8173 SoC

Remove CLK_INFRA_CA57SEL for MT8173 since it's no longer used.

Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Seiya Wang <seiya.wang@mediatek.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>