arm64: dts: exynos: switch USI clocks in ExynosAutov9

Use CMU clock nodes instead of dummy fixed-rate-clock.

Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Link: https://lore.kernel.org/r/20220504075154.58819-12-chanho61.park@samsung.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>