ARM: at91: Convert SPL_GENERATE_ATMEL_PMECC_HEADER to Kconfig

This commit converts the following items to Kconfig:

CONFIG_ATMEL_NAND_HWECC
CONFIG_ATMEL_NAND_HW_PMECC
CONFIG_PMECC_CAP
CONFIG_PMECC_SECTOR_SIZE
CONFIG_SPL_GENERATE_ATMEL_PMECC_HEADER

[PMECC References]
https://www.at91.com/linux4sam/bin/view/Linux4SAM/PmeccConfigure
https://www.at91.com/linux4sam/bin/view/Linux4SAM/AT91Bootstrap

[Mailing List Thread]
https://lists.denx.de/pipermail/u-boot/2018-December/350666.html

Fixes: 5541543f ("configs: at91: Remove CONFIG_SYS_EXTRA_OPTIONS assignment")
[trini: Make the migration be size neutral and possibly not fix the
above in all cases]
Reported-by: Daniel Evans <photonthunder@gmail.com>
Cc: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Derald D. Woods <woods.technical@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index ffc6cc9..6d46660 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -22,6 +22,44 @@
 	  Enable this driver for NAND flash platforms using an Atmel NAND
 	  controller.
 
+if NAND_ATMEL
+
+config ATMEL_NAND_HWECC
+	bool "Atmel Hardware ECC"
+	default n
+
+config ATMEL_NAND_HW_PMECC
+	bool "Atmel Programmable Multibit ECC (PMECC)"
+	select ATMEL_NAND_HWECC
+	default n
+	help
+	  The Programmable Multibit ECC (PMECC) controller is a programmable
+	  binary BCH(Bose, Chaudhuri and Hocquenghem) encoder and decoder.
+
+config PMECC_CAP
+	int "PMECC Correctable ECC Bits"
+	depends on ATMEL_NAND_HW_PMECC
+	default 2
+	help
+	  Correctable ECC bits, can be 2, 4, 8, 12, and 24.
+
+config PMECC_SECTOR_SIZE
+	int "PMECC Sector Size"
+	depends on ATMEL_NAND_HW_PMECC
+	default 512
+	help
+	  Sector size, in bytes, can be 512 or 1024.
+
+config SPL_GENERATE_ATMEL_PMECC_HEADER
+	bool "Atmel PMECC Header Generation"
+	select ATMEL_NAND_HWECC
+	select ATMEL_NAND_HW_PMECC
+	default n
+	help
+	  Generate Programmable Multibit ECC (PMECC) header for SPL image.
+
+endif
+
 config NAND_DAVINCI
 	bool "Support TI Davinci NAND controller"
 	help