net: cpsw: Fix ethernet regression for dm814x

Commit b6745f6e4e63 ("drivers: net: cpsw: davinci_emac: move reading mac
id to common file") started using of_machine_is_compatible for detecting
type but missed at dm8148 causing Ethernet to stop working.

Let's fix the issue by adding handling for dm814x.

Cc: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Acked-by: Mugunthnan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/cpsw-common.c

@@ -78,6 +78,9 @@ static int cpsw_am33xx_cm_get_macid(struct device *dev, u16 offset, int slave,
 
 int ti_cm_get_macid(struct device *dev, int slave, u8 *mac_addr)
 {
+	if (of_machine_is_compatible("ti,dm8148"))
+		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
+
 	if (of_machine_is_compatible("ti,am33xx"))
 		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);