Convert CONFIG_SPL_NAND_RAW_ONLY et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SPL_NAND_RAW_ONLY
   CONFIG_SPL_NAND_SOFTECC

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/devkit3250_defconfig b/configs/devkit3250_defconfig
index 71e80e8..5b25463 100644
--- a/configs/devkit3250_defconfig
+++ b/configs/devkit3250_defconfig
@@ -26,8 +26,10 @@
 CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_NAND_SUPPORT=y
+CONFIG_SPL_NAND_RAW_ONLY=y
 CONFIG_SPL_NAND_DRIVERS=y
 CONFIG_SPL_NAND_ECC=y
+CONFIG_SPL_NAND_SOFTECC=y
 CONFIG_SPL_NAND_SIMPLE=y
 CONFIG_CMD_IMLS=y
 CONFIG_CMD_GPIO=y