arm64: dts: qcom: msm8996: Add compat qcom,msm8996-dsi-ctrl

Add silicon specific compatible qcom,msm8996-dsi-ctrl to the
mdss-dsi-ctrl block. This allows us to differentiate the specific bindings
for msm8996 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/20221223021025.1646636-13-bryan.odonoghue@linaro.org

arch/arm64/boot/dts/qcom/msm8996.dtsi

@@ -991,7 +991,8 @@ mdp5_intf2_out: endpoint {
 			};
 
 			dsi0: dsi@994000 {
-				compatible = "qcom,mdss-dsi-ctrl";
+				compatible = "qcom,msm8996-dsi-ctrl",
+					     "qcom,mdss-dsi-ctrl";
 				reg = <0x00994000 0x400>;
 				reg-names = "dsi_ctrl";
 
@@ -1058,7 +1059,8 @@ dsi0_phy: phy@994400 {
 			};
 
 			dsi1: dsi@996000 {
-				compatible = "qcom,mdss-dsi-ctrl";
+				compatible = "qcom,msm8996-dsi-ctrl",
+					     "qcom,mdss-dsi-ctrl";
 				reg = <0x00996000 0x400>;
 				reg-names = "dsi_ctrl";