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/ls2080aqds_nand_defconfig b/configs/ls2080aqds_nand_defconfig
index 0b70e7b..effcd33 100644
--- a/configs/ls2080aqds_nand_defconfig
+++ b/configs/ls2080aqds_nand_defconfig
@@ -91,6 +91,8 @@
 CONFIG_SYS_NAND_ONFI_DETECTION=y
 CONFIG_SYS_NAND_U_BOOT_LOCATIONS=y
 CONFIG_SYS_NAND_U_BOOT_OFFS=0x40000
+CONFIG_SYS_NAND_MAX_OOBFREE=2
+CONFIG_SYS_NAND_MAX_ECCPOS=256
 CONFIG_DM_SPI_FLASH=y
 # CONFIG_SPI_FLASH_BAR is not set
 CONFIG_SPI_FLASH_SPANSION=y