configs: falcon: Enabled I2C support for R-Car V3U

Enable I2C support for R-Car V3U (R8A779A0) on Falcon board.

Signed-off-by: Nam Nguyen <nam.nguyen.yh@renesas.com>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>