dt-bindings: iio: adc: adi,ad9083: don't unnecessarily quote strings

Drop unnecessary quotes around a couple of strings. This is the
preferred style upstream.

Signed-off-by: David Lechner <[email protected]>

Author: dlech

Documentation/devicetree/bindings/iio/adc/adi,ad9083.yaml

@@ -40,7 +40,7 @@ properties:
 
   jesd204-inputs:
     description: JESD204-fsm devices phandles and specifiers (used to build the link topology)
-    $ref: "/schemas/types.yaml#/definitions/phandle"
+    $ref: /schemas/types.yaml#/definitions/phandle
 
   spi-max-frequency:
     const: 1000000
@@ -49,7 +49,7 @@ properties:
     maxItems: 1
 
   clock-names:
-    const: "adc_ref_clk"
+    const: adc_ref_clk
     description: AD9083 reference clock name
 
   adi,adc-frequency-hz: