Convert CONFIG_SPD_EEPROM to Kconfig

This converts the following to Kconfig:
   CONFIG_SPD_EEPROM

Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/socrates_defconfig b/configs/socrates_defconfig
index ab52ea2..f45f570 100644
--- a/configs/socrates_defconfig
+++ b/configs/socrates_defconfig
@@ -57,6 +57,7 @@
 CONFIG_ENV_ADDR_REDUND=0xFFF20000
 CONFIG_USE_ETHPRIME=y
 CONFIG_ETHPRIME="TSEC0"
+CONFIG_SPD_EEPROM=y
 CONFIG_CHIP_SELECTS_PER_CTRL=2
 CONFIG_SYS_BR0_PRELIM_BOOL=y
 CONFIG_SYS_BR0_PRELIM=0xFE001001