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/omap3_logic_defconfig b/configs/omap3_logic_defconfig
index 50450c9..aa70358 100644
--- a/configs/omap3_logic_defconfig
+++ b/configs/omap3_logic_defconfig
@@ -18,6 +18,7 @@
 CONFIG_SYS_PROMPT="OMAP Logic # "
 # CONFIG_CMD_IMI is not set
 # CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_EEPROM is not set
 # CONFIG_CMD_FLASH is not set
 # CONFIG_CMD_USB is not set
 # CONFIG_CMD_FPGA is not set