Azure/GitLab/Travis: Add SH4 r2dplus machine with various PCI ethernet options

Add SH4 R2Dplus machine configured to test various U-Boot PCI ethernet
options -- RTL8139, EEPRO100, AMD PCnet, DEC Tulip.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>