arm64: dts: qcom: sm8450: Add compat qcom,sm8450-dsi-ctrl

Add silicon specific compatible qcom,sm8450-dsi-ctrl to the
mdss-dsi-ctrl block. This allows us to differentiate the specific bindings
for sm8450 against the yaml documentation.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230110055433.734188-3-dmitry.baryshkov@linaro.org

arch/arm64/boot/dts/qcom/sm8450.dtsi

@@ -2770,7 +2770,7 @@ opp-500000000 {
 			};
 
 			mdss_dsi0: dsi@ae94000 {
-				compatible = "qcom,mdss-dsi-ctrl";
+				compatible = "qcom,sm8450-dsi-ctrl", "qcom,mdss-dsi-ctrl";
 				reg = <0 0x0ae94000 0 0x400>;
 				reg-names = "dsi_ctrl";
 
@@ -2862,7 +2862,7 @@ mdss_dsi0_phy: phy@ae94400 {
 			};
 
 			mdss_dsi1: dsi@ae96000 {
-				compatible = "qcom,mdss-dsi-ctrl";
+				compatible = "qcom,sm8450-dsi-ctrl", "qcom,mdss-dsi-ctrl";
 				reg = <0 0x0ae96000 0 0x400>;
 				reg-names = "dsi_ctrl";