net: phy: dp83867: default to 2ns delay if unspecified in device-tree

Since Linux commit c360eb0c3ccb ("dt-bindings: net: ethernet-controller:
Add informative text about RGMII delays"), the interpretation of RGMII
delays has changed. Prior to the commit, the RGMII Variant among "rgmii",
"rgmii-id", "rgmii-rxid" and "rgmii-txid" clearly specified whether it is
the MAC or the PHY that "should" add the delay. However, post that commit,
the RGMII Variant only specifies whether or not there is a delay on the
PCB traces between the MAC and the PHY, leaving it open as to who adds the
delay.

Hence, instead of enforcing the existence of the device-tree properties
"ti,rx-internal-delay" and "ti,tx-internal-delay", default to a delay
of 2ns, while continuing to override this delay with the aforementioned
properties, if they exist in the device-tree.

This is in line with the Linux driver implementation updated by commit
6bf78849371d ("net: phy: dp83867: use 2ns delay if not specified in DTB").

Signed-off-by: Siddharth Vadapalli <[email protected]>
Reviewed-by: Anshul Dalal <[email protected]>

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