net: smc911x: Drop the standalone EEPROM example

net: smc911x: Drop the standalone EEPROM example

Drop the example, for two reasons. First, it is tapping directly into
the IO accessors of the SMC911x, while it should instead go through
the net device API. Second, this makes conversion of the SMC911x driver
to DM real hard.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Tom Rini <trini@konsulko.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>