cmd: eeprom: Fix config dependency

We should have CONFIG_DM_I2C or CONFIG_SYS_I2C_LEGACY enabled in
order for `cmd/eeprom.c` to compile as it depends on the i2c functions
which are not compiled otherwise. Update the Kconfig entry for the
'eeprom' command correspondingly.

Signed-off-by: Ivan Orlov <ivan.orlov@codethink.co.uk>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 438c6d1..3d204ed 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -740,6 +740,7 @@
 
 config CMD_EEPROM
 	bool "eeprom - EEPROM subsystem"
+	depends on DM_I2C || SYS_I2C_LEGACY
 	help
 	  (deprecated, needs conversion to driver model)
 	  Provides commands to read and write EEPROM (Electrically Erasable