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/sifive_unmatched_defconfig b/configs/sifive_unmatched_defconfig
index 38b7acd..bdd045a 100644
--- a/configs/sifive_unmatched_defconfig
+++ b/configs/sifive_unmatched_defconfig
@@ -18,6 +18,7 @@
 CONFIG_DISPLAY_CPUINFO=y
 CONFIG_DISPLAY_BOARDINFO=y
 CONFIG_DISPLAY_BOARDINFO_LATE=y
+CONFIG_ID_EEPROM=y
 CONFIG_SPL_SEPARATE_BSS=y
 CONFIG_SPL_DM_RESET=y
 CONFIG_SPL_YMODEM_SUPPORT=y