dt-bindings: display/msm: add sm8350 and sm8450 DSI PHYs

dt-bindings: display/msm: add sm8350 and sm8450 DSI PHYs

SM8350 and SM8450 platforms use the same driver and same bindings as the
existing 7nm DSI PHYs. Add corresponding compatibility strings.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/514228/
Link: https://lore.kernel.org/r/20221207012231.112059-4-dmitry.baryshkov@linaro.org
[DB: changed compatibles per Krzysztof's request]
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>