Enable the I2C0 bus on the Gray Hawk Single board, and describe the I2C
EEPROMs present.

Based on patches for Gray Hawk in the BSP by Hai Pham.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/960595394a274b675f1ec9ec1c324e4cc1ac1f77.1706796660.git.geert+renesas@glider.be