arm64: dts: renesas: spider-cpu: Add I2C4 and EEPROMs

Enable the I2C4 bus on the Falcon CPU board, and describe the I2C EEPROMs
present on the Spider CPU and BreakOut boards.

Extracted from a larger patch in the BSP by LUU HOAI.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/6d8917e49f83b6a932970ca169100eb086d11f16.1643898884.git.geert+renesas@glider.be