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/redwood_defconfig b/configs/redwood_defconfig
index 425b2fe..78b004f 100644
--- a/configs/redwood_defconfig
+++ b/configs/redwood_defconfig
@@ -9,6 +9,7 @@
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_ASKENV=y
 CONFIG_CMD_GREPENV=y
+CONFIG_CMD_EEPROM=y
 CONFIG_LOOPW=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_DHCP=y