net: macb: workaround for macb1

As the MACB1 share pin with LCD, so when design hardware, there
is an buffer chip bwteen these two devices, which cause the phy
can not get the reset strap value correctly.

Add a workaround to make the macb1 working.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
ARM: atmel: sama5d4ek: add MACB1 support

As the MACB1 share pin with LCD, so enable MACB1 must disable LCD.
So, use sama5d4ek_2macb_mmc, sama5d4ek_2macb_nandflash,
sama5d4ek_2macb_spiflash to enable MACB1 and disable LCD.

(Need to close JP2 on EK board)

Signed-off-by: Bo Shen <voice.shen@atmel.com>