Convert CONFIG_ID_EEPROM to Kconfig

This converts the following to Kconfig:
   CONFIG_ID_EEPROM

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/MPC8548CDS_legacy_defconfig b/configs/MPC8548CDS_legacy_defconfig
index 83f7382..c38064d 100644
--- a/configs/MPC8548CDS_legacy_defconfig
+++ b/configs/MPC8548CDS_legacy_defconfig
@@ -12,6 +12,7 @@
 CONFIG_SYS_EXTRA_OPTIONS="LEGACY"
 CONFIG_BOOTDELAY=10
 # CONFIG_MISC_INIT_R is not set
+CONFIG_ID_EEPROM=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_IMLS=y
 CONFIG_CMD_I2C=y