drivers: net: cpsw: add support for reading mac address from efuse

Different TI platforms has to read with different combination to
get the mac address from efuse. So add support to read mac address
based on machine/device compatibles.

The code is taken from Linux drivers/net/ethernet/ti/cpsw-common.c
done by Tony Lindgren.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/include/cpsw.h b/include/cpsw.h
index cf1d30b..6255cd8 100644
--- a/include/cpsw.h
+++ b/include/cpsw.h
@@ -51,5 +51,6 @@
 };
 
 int cpsw_register(struct cpsw_platform_data *data);
+int ti_cm_get_macid(struct udevice *dev, int slave, u8 *mac_addr);
 
 #endif /* _CPSW_H_  */