Convert CONFIG_SYS_NAND_MAX_OOBFREE et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_NAND_MAX_OOBFREE
   CONFIG_SYS_NAND_MAX_ECCPOS

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/ls1088aqds_defconfig b/configs/ls1088aqds_defconfig
index 1e86590..8556c00 100644
--- a/configs/ls1088aqds_defconfig
+++ b/configs/ls1088aqds_defconfig
@@ -83,6 +83,8 @@
 CONFIG_MTD_RAW_NAND=y
 CONFIG_NAND_FSL_IFC=y
 CONFIG_SYS_NAND_ONFI_DETECTION=y
+CONFIG_SYS_NAND_MAX_OOBFREE=2
+CONFIG_SYS_NAND_MAX_ECCPOS=256
 CONFIG_DM_SPI_FLASH=y
 CONFIG_PHYLIB=y
 CONFIG_PHYLIB_10G=y