Convert CONFIG_SYS_NAND_ONFI_DETECTION to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_NAND_ONFI_DETECTION

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/harmony_defconfig b/configs/harmony_defconfig
index 2372d17..6ce4f55 100644
--- a/configs/harmony_defconfig
+++ b/configs/harmony_defconfig
@@ -37,6 +37,7 @@
 CONFIG_MTD=y
 CONFIG_DM_MTD=y
 CONFIG_MTD_RAW_NAND=y
+CONFIG_SYS_NAND_ONFI_DETECTION=y
 CONFIG_MTD_UBI_FASTMAP=y
 CONFIG_PCI=y
 CONFIG_DM_PMIC=y