global: Move remaining CONFIG_SYS_NAND_* to CFG_SYS_NAND_*

The rest of the unmigrated CONFIG symbols in the CONFIG_SYS_NAND
namespace do not easily transition to Kconfig. In many cases they likely
should come from the device tree instead. Move these out of CONFIG
namespace and in to CFG namespace.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/board/ti/am335x_evm.rst b/doc/board/ti/am335x_evm.rst
index a90f32d..0b230cf 100644
--- a/doc/board/ti/am335x_evm.rst
+++ b/doc/board/ti/am335x_evm.rst
@@ -54,7 +54,7 @@
 	CONFIG_SYS_NAND_PAGE_SIZE	number of main bytes in NAND page
 	CONFIG_SYS_NAND_OOBSIZE		number of OOB bytes in NAND page
 	CONFIG_SYS_NAND_BLOCK_SIZE	number of bytes in NAND erase-block
-	CONFIG_SYS_NAND_ECCPOS		ECC map for NAND page
+	CFG_SYS_NAND_ECCPOS		ECC map for NAND page
 	CONFIG_NAND_OMAP_ECCSCHEME	(refer doc/README.nand)
 
 Step-2: Flashing NAND via MMC/SD