ASoC: tlv320aic3x: Add optional clock and port properties

Describe optional properties for clocks and ports that were missing in
the original txt binding, to fix warnings like:

aic33@18: 'assigned-clock-parents', 'assigned-clock-rates',
'assigned-clocks' do not match any of the regexes:
'pinctrl-[0-9]+'
arch/arm/boot/dts/omap2420-n810.dtb

tlv320aic3106@1b: 'port' does not match any of the regexes:
'pinctrl-[0-9]+'
arch/arm/boot/dts/am335x-sl50.dtb

codec@18: 'clocks' does not match any of the regexes: 'pinctrl-[0-9]+'
arch/arm/boot/dts/imx6dl-gw5903.dtb
arch/arm/boot/dts/imx6q-gw5903.dtb

Some uses of "port" still lead to warnings because they pass clocks in
the endpoint, but that is discouraged:
https://lore.kernel.org/all/[e-mail]/

Signed-off-by: Jai Luthra <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/ti,tlv320aic3x.yaml

···
   '#sound-dai-cells':
     const: 0
 
+  clocks:
+    maxItems: 1
+
+  port:
+    $ref: audio-graph-port.yaml#
+    unevaluatedProperties: false
+
 required:
   - compatible
   - reg