dt-bindings: drm/bridge: MHDP8546 bridge binding changes for HDCP

Add binding changes for HDCP in the MHDP8546 DPI/DP bridge binding.
Signed-off-by: Parshuram Thombare <pthombar@cadence.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1618078508-30466-1-git-send-email-pthombar@cadence.com

Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml

@@ -18,7 +18,7 @@ properties:
 
   reg:
     minItems: 1
-    maxItems: 2
+    maxItems: 3
     items:
       - description:
           Register block of mhdptx apb registers up to PHY mapped area (AUX_CONFIG_P).
@@ -26,13 +26,16 @@ properties:
           included in the associated PHY.
       - description:
           Register block for DSS_EDP0_INTG_CFG_VP registers in case of TI J7 SoCs.
+      - description:
+          Register block of mhdptx sapb registers.
 
   reg-names:
     minItems: 1
-    maxItems: 2
+    maxItems: 3
     items:
       - const: mhdptx
       - const: j721e-intg
+      - const: mhdptx-sapb
 
   clocks:
     maxItems: 1
@@ -99,14 +102,18 @@ allOf:
       properties:
         reg:
           minItems: 2
+          maxItems: 3
         reg-names:
           minItems: 2
+          maxItems: 3
     else:
       properties:
         reg:
-          maxItems: 1
+          minItems: 1
+          maxItems: 2
         reg-names:
-          maxItems: 1
+          minItems: 1
+          maxItems: 2
 
 required:
   - compatible