mtd: nand: raw: Move CONFIG_SYS_NAND_USE_FLASH_BBT to Kconfig

Convert CONFIG_SYS_NAND_USE_FLASH_BBT to Kconfig, update defconfigs,
headers and whitelist.

Please note that this symbol already was used in Kconfig
(imply in CONFIG_NAND_ATMEL) which did not work, since this symbol was
not available in Kconfig. This changes now with this patch and all
boards with CONFIG_NAND_ATMEL will have BBT enabled. Which is what
I also need on my GARDENA AT91SAM based board.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Eugen Hristev <eugen.hristev@microchip.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Gregory CLEMENT <gregory.clement@bootlin.com>
[trini: Rework such that the configs are unchanged to start with]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index f86035b..a129f44 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -15,6 +15,11 @@
 	  Omit standard ECC layouts to safe space. Select this if your driver
 	  is known to provide its own ECC layout.
 
+config SYS_NAND_USE_FLASH_BBT
+	bool "Enable BBT (Bad Block Table) support"
+	help
+	  Enable the BBT (Bad Block Table) usage.
+
 config NAND_ATMEL
 	bool "Support Atmel NAND controller"
 	imply SYS_NAND_USE_FLASH_BBT