dt-bindings: net: renesas,etheravb: RZ/G2H needs tx-internal-delay-ps

dt-bindings: net: renesas,etheravb: RZ/G2H needs tx-internal-delay-ps

The merge resolution of the interaction of commits ed490a639ed47520
("dt-bindings: net: renesas,ravb: Add support for r8a774e1 SoC") and
4407b30c88d8f150 ("dt-bindings: net: renesas,etheravb: Convert to
json-schema") missed that "tx-internal-delay-ps" should be a required
property on RZ/G2H.

Fixes: 10a59a3ae4d8fd5a ("Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210105151516.1540653-1-geert+renesas@glider.be
Signed-off-by: Jakub Kicinski <kuba@kernel.org>