ls1021a: Set CONFIG_SYS_BOOTMAPSZ to the memory for relocation

This patch sets CONFIG_SYS_BOOTMAPSZ to the amount of memory available
to safely contain a kernel, device tree and initrd for relocation. The
way to set fdt_high as 0xffffffff to disable device tree relocation is
removed.

Signed-off-by: Alison Wang <alison.wang@nxp.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/include/configs/ls1021atsn.h b/include/configs/ls1021atsn.h
index 984df62..46c60aa 100644
--- a/include/configs/ls1021atsn.h
+++ b/include/configs/ls1021atsn.h
@@ -154,7 +154,6 @@
 #define CONFIG_EXTRA_ENV_SETTINGS					\
 	"bootargs=root=/dev/ram0 rw console=ttyS0,115200\0"		\
 	"initrd_high=0xffffffff\0"					\
-	"fdt_high=0xffffffff\0"						\
 	"fdt_addr=0x64f00000\0"						\
 	"kernel_addr=0x61000000\0"					\
 	"kernelheader_addr=0x60800000\0"				\
@@ -216,6 +215,8 @@
 		"bootm $load_addr#$board\0"
 
 /* Miscellaneous configurable options */
+#define CONFIG_SYS_BOOTMAPSZ		(256 << 20)
+
 #define CONFIG_SYS_CBSIZE		256	/* Console I/O Buffer Size */
 #define CONFIG_SYS_PBSIZE		\
 		(CONFIG_SYS_CBSIZE + sizeof(CONFIG_SYS_PROMPT) + 16)