armv8: ls2080a: Reorganise NAND_BOOT code in config flag

Add CONFIG_NAND_BOOT config flag to organise
NAND_BOOT specific code in config flag like
-nand-boot specfic errata errata_rcw_src()
-CONFIG_SYS_NAND_U_BOOT_DST,etc

Signed-off-by: Santan Kumar <santan.kumar@nxp.com>
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
Signed-off-by: Abhimanyu Saini <abhimanyu.saini@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/include/configs/ls2080a_common.h b/include/configs/ls2080a_common.h
index 3706b1a..43c5fef 100644
--- a/include/configs/ls2080a_common.h
+++ b/include/configs/ls2080a_common.h
@@ -233,8 +233,10 @@
 #define CONFIG_SPL_TARGET		"u-boot-with-spl.bin"
 #define CONFIG_SPL_TEXT_BASE		0x1800a000
 
+#ifdef CONFIG_NAND_BOOT
 #define CONFIG_SYS_NAND_U_BOOT_DST	0x80400000
 #define CONFIG_SYS_NAND_U_BOOT_START	CONFIG_SYS_NAND_U_BOOT_DST
+#endif
 #define CONFIG_SYS_SPL_MALLOC_SIZE	0x00100000
 #define CONFIG_SYS_SPL_MALLOC_START	0x80200000
 #define CONFIG_SYS_MONITOR_LEN		(640 * 1024)