[U-Boot] [PATCH v3 1/2] net: macb: Add remove callback

[sjg at google.com]

To avoid the failure of mdio_register(), add the remove callback
to unregister the mii_dev when removing the ethernet device.

Signed-off-by: Wenyou Yang <wenyou.yang at atmel.com>
Acked-by: Joe Hershberger <joe.hershberger at ni.com>
---

Changes in v3: None
Changes in v2:
 - Rebase on v2017.03.

 drivers/net/macb.c | 45 +++++++++++++++++++++++++++++----------------
 1 file changed, 29 insertions(+), 16 deletions(-)

Applied to u-boot-dm/next, thanks!