dt-bindings: Require child nodes type to be 'object'

A node is always an object (aka a dictionary), so make that explicit for
child node schemas.

A meta-schema update will enforce having 'type' specified.

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/arm/cpus.yaml

@@ -67,6 +67,7 @@ properties:
 
 patternProperties:
   '^cpu@[0-9a-f]+$':
+    type: object
     properties:
       device_type:
         const: cpu

Documentation/devicetree/bindings/interrupt-controller/arm,gic.yaml

@@ -129,6 +129,7 @@ required:
 
 patternProperties:
   "^v2m@[0-9a-f]+$":
+    type: object
     description: |
       * GICv2m extension for MSI/MSI-x support (Optional)
 

Documentation/devicetree/bindings/timer/arm,arch_timer_mmio.yaml

@@ -59,6 +59,7 @@ properties:
 
 patternProperties:
   '^frame@[0-9a-z]*$':
+    type: object
     description: A timer node has up to 8 frame sub-nodes, each with the following properties.
     properties:
       frame-number: