arm64: dts: renesas: r8a779g0: Correct avb[01] reg sizes

arm64: dts: renesas: r8a779g0: Correct avb[01] reg sizes

All Ethernet AVB instances on R-Car V4H have registers related to UDP/IP
support, but the declared register blocks for the first two instances
are too small to cover them.

Fix this by extending the register block sizes.

Fixes: 848c82db56923a8b ("arm64: dts: renesas: r8a779g0: Add RAVB nodes")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/83437778614a7c96f4d8f1be98dffeee29bb4a0b.1707660323.git.geert+renesas@glider.be