Remove device tree booting dependency on CONFIG_SYS_BOOTMAPSZ

The previous patch makes u-boot use the full accessible size of ram as
the default boot mapped size if CONFIG_SYS_BOOTMAPSZ is not defined,
which means boot_relocate_fdt() can be changed to depend solely on
CONFIG_OF_LIBFDT.

Signed-off-by: Grant Likely <grant.likely@linaro.org>
diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index 989bf73..a23e465 100644
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -544,7 +544,7 @@
 		}
 			break;
 #endif
-#if defined(CONFIG_OF_LIBFDT) && defined(CONFIG_SYS_BOOTMAPSZ)
+#if defined(CONFIG_OF_LIBFDT)
 		case BOOTM_STATE_FDT:
 		{
 			ret = boot_relocate_fdt(&images.lmb,