powerpc/p1010rdb: add EEPROMs to device tree

Add EEPROM to the P1010RDB device tree.
The 24c01 acts as a memory SPD so it shouldn't be overwritten without
care.
The 24c256 is a general purpose memory.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>