arm64: dts: renesas: r8a779a0: Add I2C nodes

Add I2C devicetree description to V3U

Signed-off-by: Koji Matsuoka <koji.matsuoka.xm@renesas.com>
[wsa: rebased and double checked]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20210121095420.5023-3-wsa+renesas@sang-engineering.com


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