dt-bindings: phy: ti: phy-gmii-sel: Cleanup example

Change node name in example from "phy-gmii-sel" to "phy", following the
device-tree convention of using generic node names.
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220912085650.83263-2-s-vadapalli@ti.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/ti,phy-gmii-sel.yaml

@@ -97,7 +97,7 @@ additionalProperties: false
 
 examples:
   - |
-    phy_gmii_sel: phy-gmii-sel@650 {
+    phy_gmii_sel: phy@650 {
         compatible = "ti,am3352-phy-gmii-sel";
         reg = <0x650 0x4>;
         #phy-cells = <2>;