Convert CONFIG_CMD_EEPROM et al to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_EEPROM
   CONFIG_CMD_EEPROM_LAYOUT
   CONFIG_EEPROM_LAYOUT_HELP_STRING

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
[trini: Rework Kconfig logic slightly, define EEPROM location on TI eval
platforms]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/cm_fx6_defconfig b/configs/cm_fx6_defconfig
index 5a371c7..fb2f9fa 100644
--- a/configs/cm_fx6_defconfig
+++ b/configs/cm_fx6_defconfig
@@ -23,6 +23,9 @@
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_XIMG is not set
 CONFIG_CMD_GREPENV=y
+CONFIG_CMD_EEPROM=y
+CONFIG_CMD_EEPROM_LAYOUT=y
+CONFIG_EEPROM_LAYOUT_HELP_STRING="v2, v3"
 # CONFIG_CMD_LOADB is not set
 # CONFIG_CMD_LOADS is not set
 # CONFIG_CMD_FLASH is not set