dt-bindings: Remove redundant 'maxItems'

There's no need to specify 'maxItems' with the same value as the number
of entries in 'items'. A meta-schema update will catch future cases.

Cc: Shawn Guo <[e-mail]>
Cc: Sascha Hauer <[e-mail]>
Cc: Anson Huang <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Reviewed-by: Stephen Boyd <[e-mail]> # clk
Acked-by: Thierry Reding <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/clock/imx6q-clock.yaml

···
     items:
       - description: CCM interrupt request 1
       - description: CCM interrupt request 2
-    maxItems: 2
 
   '#clock-cells':
     const: 1

Documentation/devicetree/bindings/clock/imx6sl-clock.yaml

···
     items:
       - description: CCM interrupt request 1
       - description: CCM interrupt request 2
-    maxItems: 2
 
   '#clock-cells':
     const: 1

Documentation/devicetree/bindings/clock/imx6sll-clock.yaml

···
     items:
       - description: CCM interrupt request 1
       - description: CCM interrupt request 2
-    maxItems: 2
 
   '#clock-cells':
     const: 1

Documentation/devicetree/bindings/clock/imx6sx-clock.yaml

···
     items:
       - description: CCM interrupt request 1
       - description: CCM interrupt request 2
-    maxItems: 2
 
   '#clock-cells':
     const: 1

Documentation/devicetree/bindings/clock/imx6ul-clock.yaml

···
     items:
       - description: CCM interrupt request 1
       - description: CCM interrupt request 2
-    maxItems: 2
 
   '#clock-cells':
     const: 1

Documentation/devicetree/bindings/pwm/imx-pwm.yaml

···
     items:
       - description: SoC PWM ipg clock
       - description: SoC PWM per clock
-    maxItems: 2
 
   clock-names:
     items:
       - const: ipg
       - const: per
-    maxItems: 2
 
   interrupts:
     maxItems: 1

Documentation/devicetree/bindings/usb/nvidia,tegra-xudc.yaml

···
      - const: hs_src
 
   power-domains:
-    maxItems: 2
     items:
       - description: XUSBB(device) power-domain
       - description: XUSBA(superspeed) power-domain
 
   power-domain-names:
-    maxItems: 2
     items:
       - const: dev
       - const: ss