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/ls2080aqds.h b/include/configs/ls2080aqds.h
index d0b0aa9..e6ebec5 100644
--- a/include/configs/ls2080aqds.h
+++ b/include/configs/ls2080aqds.h
@@ -198,7 +198,8 @@
 					FTIM2_GPCM_TWP(0x3E))
 #define CONFIG_SYS_CS3_FTIM3		0x0
 
-#if defined(CONFIG_SPL) && defined(CONFIG_NAND)
+#if defined(CONFIG_SPL)
+#if defined(CONFIG_NAND_BOOT)
 #define CONFIG_SYS_CSPR1_EXT		CONFIG_SYS_NOR0_CSPR_EXT
 #define CONFIG_SYS_CSPR1		CONFIG_SYS_NOR0_CSPR_EARLY
 #define CONFIG_SYS_CSPR1_FINAL		CONFIG_SYS_NOR0_CSPR
@@ -234,6 +235,7 @@
 #define CONFIG_SPL_PAD_TO		0x20000
 #define CONFIG_SYS_NAND_U_BOOT_OFFS	(256 * 1024)
 #define CONFIG_SYS_NAND_U_BOOT_SIZE	(640 * 1024)
+#endif
 #else
 #define CONFIG_SYS_CSPR0_EXT		CONFIG_SYS_NOR0_CSPR_EXT
 #define CONFIG_SYS_CSPR0		CONFIG_SYS_NOR0_CSPR_EARLY