Convert CONFIG_SYS_NAND_HW_ECC_OOBFIRST to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_NAND_HW_ECC_OOBFIRST

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index 48a7507..49b7a4b 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -712,6 +712,11 @@
 	help
 	  Support for NAND boot using simple NAND drivers that
 	  expose the cmd_ctrl() interface.
+
+config SYS_NAND_HW_ECC_OOBFIRST
+	bool "In SPL, read the OOB first and then the data from NAND"
+	depends on SPL_NAND_SIMPLE
+
 endif
 
 endif   # if NAND