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/configs/axm_defconfig b/configs/axm_defconfig
index 3584514..a1d374a 100644
--- a/configs/axm_defconfig
+++ b/configs/axm_defconfig
@@ -58,6 +58,7 @@
 CONFIG_CLK_AT91=y
 # CONFIG_MMC is not set
 CONFIG_NAND=y
+# CONFIG_SYS_NAND_USE_FLASH_BBT is not set
 CONFIG_NAND_ATMEL=y
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SPI_FLASH=y