dt-bindings: ufs: ti: Add missing 'additionalProperties: false'

The ti,j721e-ufs schema is missing an 'additionalProperties: false'. Add
that and and the missing assigned-clock properties.

Acked-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/ufs/ti,j721e-ufs.yaml

@@ -25,6 +25,12 @@ properties:
   power-domains:
     maxItems: 1
 
+  assigned-clocks:
+    maxItems: 1
+
+  assigned-clock-parents:
+    maxItems: 1
+
   "#address-cells":
     const: 2
 
@@ -47,6 +53,8 @@ patternProperties:
       Documentation/devicetree/bindings/ufs/cdns,ufshc.txt for binding
       documentation of child node
 
+additionalProperties: false
+
 examples:
   - |
     #include <dt-bindings/interrupt-controller/irq.h>