arm64: dts: renesas: r8a774b1: Add PCIe device nodes

This patch adds PCIe{0,1} device nodes for R8A774B1 SoC.

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Andrew Murray <andrew.murray@arm.com>
Link: https://lore.kernel.org/r/1570178133-21532-7-git-send-email-fabrizio.castro@bp.renesas.com


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