arm64: dts: qcom: msm8996-xiaomi-common: drop excton from the USB PHY

The USB PHYs don't use extcon connectors, drop the extcon property from
the hsusb_phy1 node.

Fixes: 46680fe9 ("arm64: dts: qcom: msm8996: Add support for the Xiaomi MSM8996 platform")
Cc: Yassine Oudjana <y.oudjana@protonmail.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240501-qcom-phy-fixes-v1-13-f1fd15c33fb3@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>