net: phy: mdio-bcm-unimac: Add BCM6846 support

Add Unimac mdio compatible string for the special BCM6846
variant.

This variant has a few extra registers compared to other
versions.

Suggested-by: Florian Fainelli <[email protected]>
Link: https://lore.kernel.org/linux-devicetree/[email protected]/
Signed-off-by: Linus Walleij <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: linusw

drivers/net/mdio/mdio-bcm-unimac.c

@@ -337,6 +337,7 @@ static const struct of_device_id unimac_mdio_ids[] = {
 	{ .compatible = "brcm,asp-v2.2-mdio", },
 	{ .compatible = "brcm,asp-v2.1-mdio", },
 	{ .compatible = "brcm,asp-v2.0-mdio", },
+	{ .compatible = "brcm,bcm6846-mdio", },
 	{ .compatible = "brcm,genet-mdio-v5", },
 	{ .compatible = "brcm,genet-mdio-v4", },
 	{ .compatible = "brcm,genet-mdio-v3", },