arm64: dts: qcom: sm8350: Fix DSI PHY compatibles

The compatibles were wrong, resulting in the driver not probing. Fix
that.

Fixes: d4a44105

 ("arm64: dts: qcom: sm8350: Add display system nodes")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230120210101.2146852-5-konrad.dybcio@linaro.org