Convert CONFIG_SPL_NAND_LOAD et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SPL_NAND_LOAD
   CONFIG_SYS_NAND_BLOCK_SIZE
   CONFIG_SYS_NAND_PAGE_SIZE
   CONFIG_SYS_NAND_OOBSIZE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/ls1046a_common.h b/include/configs/ls1046a_common.h
index f0bde08..f199c94 100644
--- a/include/configs/ls1046a_common.h
+++ b/include/configs/ls1046a_common.h
@@ -166,7 +166,7 @@
 #elif defined(CONFIG_QSPI_BOOT)
 #define CONFIG_SYS_FMAN_FW_ADDR		0x40900000
 #elif defined(CONFIG_NAND_BOOT)
-#define CONFIG_SYS_FMAN_FW_ADDR		(36 * CONFIG_SYS_NAND_BLOCK_SIZE)
+#define CONFIG_SYS_FMAN_FW_ADDR		(36 * (256 * 1024))
 #else
 #define CONFIG_SYS_FMAN_FW_ADDR		0x60900000
 #endif