ARM: dts: exynos: align HSOTG/USB node names

The DT schema expect HSOTG node names to be named "usb":

  exynos4210-smdkv310.dtb: hsotg@12480000: $nodename:0: 'hsotg@12480000' does not match '^usb(@.*)?'

Link: https://lore.kernel.org/r/20230120155404.323386-9-krzysztof.kozlowski@linaro.org


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