Convert CONFIG_ATMEL_NAND_HW_PMECC et al to Kconfig

This converts the following to Kconfig:
   CONFIG_ATMEL_NAND_HW_PMECC
   CONFIG_ATMEL_NAND_HWECC
   CONFIG_NAND_ATMEL
   CONFIG_PMECC_CAP
   CONFIG_PMECC_SECTOR_SIZE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/sam9x60ek_nandflash_defconfig b/configs/sam9x60ek_nandflash_defconfig
index b59e4be..d09f788 100644
--- a/configs/sam9x60ek_nandflash_defconfig
+++ b/configs/sam9x60ek_nandflash_defconfig
@@ -50,6 +50,10 @@
 CONFIG_DM_MMC=y
 CONFIG_GENERIC_ATMEL_MCI=y
 CONFIG_MTD=y
+# CONFIG_SYS_NAND_USE_FLASH_BBT is not set
+CONFIG_NAND_ATMEL=y
+CONFIG_ATMEL_NAND_HW_PMECC=y
+CONFIG_PMECC_CAP=8
 CONFIG_PHY_MICREL=y
 CONFIG_DM_ETH=y
 CONFIG_MACB=y