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Enable Ethernet{0,1} interfaces on RZ/G2UL SMARC EVK.

Ethernet0 pins are muxed with CAN0, CAN1, SSI1 and RSPI1 pins and Ethernet0
device selection is based on the SW1[3] switch position.

Set SW1[3] to position OFF for selecting CAN0, CAN1, SSI1 and RSPI1.
Set SW1[3] to position ON for selecting Ethernet0.

This patch disables Ethernet0 on RZ/G2UL SMARC platform by default.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20220402081328.26292-8-biju.das.jz@bp.renesas.com

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>