ARM: dts: qcom: sdx55: add specific compatible for USB HS PHY

Add SoC-specific compatible to the USB HS PHY to match other devices and
bindings.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221223161835.112079-2-krzysztof.kozlowski@linaro.org