arm64: dts: qcom: sm8250: Add compat qcom,sm8250-dsi-ctrl

Add silicon specific compatible qcom,sm8250-dsi-ctrl to the
mdss-dsi-ctrl block. This allows us to differentiate the specific bindings
for sm8250 against the yaml documentation.
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221223021025.1646636-19-bryan.odonoghue@linaro.org

arch/arm64/boot/dts/qcom/sm8250.dtsi

@@ -4074,7 +4074,8 @@ opp-460000000 {
 			};
 
 			dsi0: dsi@ae94000 {
-				compatible = "qcom,mdss-dsi-ctrl";
+				compatible = "qcom,sm8250-dsi-ctrl",
+					     "qcom,mdss-dsi-ctrl";
 				reg = <0 0x0ae94000 0 0x400>;
 				reg-names = "dsi_ctrl";
 
@@ -4165,7 +4166,8 @@ dsi0_phy: phy@ae94400 {
 			};
 
 			dsi1: dsi@ae96000 {
-				compatible = "qcom,mdss-dsi-ctrl";
+				compatible = "qcom,sm8250-dsi-ctrl",
+					     "qcom,mdss-dsi-ctrl";
 				reg = <0 0x0ae96000 0 0x400>;
 				reg-names = "dsi_ctrl";