cmd: eeprom: Extend to EEPROMs probed via driver model

cmd: eeprom: Extend to EEPROMs probed via driver model

Extend the 'eeprom' command to allow accessing EEPROMs probed via
driver model, uclass UCLASS_I2C_EEPROM.

When the CONFIG_I2C_EEPROM config option is enabled (and so the
i2c-eeprom driver is built), the 'eeprom' command now accepts driver
model device name as EEPROM specifier for the 'eeprom' command, in
addition to the legacy [[bus] devaddr] specifier.

Moreover if no device specifier is given, then the first
UCLASS_I2C_EEPROM device is used, if found.

Signed-off-by: Marek Behún <kabel@kernel.org>