net: ravb: Add R-Car Gen4 support

Add support for R-Car Gen4 SoCs and a matching DT compatible.

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
[Marek: Drop SoC specific compatible, use RCAR_64 Kconfig symbol, update commit message]
2 files changed