arm64: dts: qcom: sm8550: fix DSI controller compatible

Add missing sm8550 soc specific compatible before fallback to
match the updated bindings.

Fixes: d7da51db ("arm64: dts: qcom: sm8550: add display hardware devices")
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230207-topic-sm8550-upstream-sm8550-dt-fix-v1-1-698d132ab285@linaro.org

arch/arm64/boot/dts/qcom/sm8550.dtsi

@@ -2188,7 +2188,7 @@ opp-514000000 {
 			};
 
 			mdss_dsi0: dsi@ae94000 {
-				compatible = "qcom,mdss-dsi-ctrl";
+				compatible = "qcom,sm8550-dsi-ctrl", "qcom,mdss-dsi-ctrl";
 				reg = <0 0x0ae94000 0 0x400>;
 				reg-names = "dsi_ctrl";
 
@@ -2282,7 +2282,7 @@ mdss_dsi0_phy: phy@ae95000 {
 			};
 
 			mdss_dsi1: dsi@ae96000 {
-				compatible = "qcom,mdss-dsi-ctrl";
+				compatible = "qcom,sm8550-dsi-ctrl", "qcom,mdss-dsi-ctrl";
 				reg = <0 0x0ae96000 0 0x400>;
 				reg-names = "dsi_ctrl";