arm64: dts: renesas: salvator-common: add eeprom

Add the EEPROM found on Salvator-X and -XS boards for H3, M3-W, and M3-N
on the IIC_DVFS bus.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>