Add support for generic EEPROM access via a character driver.  Add also the EEPROM driver itself.  From Sebastien Lorquet

Nucleo F4x1RE: Typos in previously untested code. message() does not exist, return value from void function, missing inclusion of errno.h.  From Sébastien Lorquet

Add logic to netdev_findbyaddr() to return the correct network device for the case where a broadcast address is used.  This change caused trivial ripples through other files because additional parameters are required for netdev_findbyaddr() when CONFIG_NET_MULTINIC

Network routing:  Refuse to perform routing table lookups for the Broadcast IP address.  From Brennan Ashton