Respect memreserve regions specified in the device tree

If a regions is reserved in the fdt, then it should not be used.  Add
the memreserve regions to the lmb so that u-boot doesn't use them to
store the initrd.

Signed-off-by: Grant Likely <grant.likely@linaro.org>
diff --git a/arch/powerpc/lib/bootm.c b/arch/powerpc/lib/bootm.c
index 6be22c4..e01787d 100644
--- a/arch/powerpc/lib/bootm.c
+++ b/arch/powerpc/lib/bootm.c
@@ -239,6 +239,10 @@
 
 	int ret;
 
+#if defined(CONFIG_OF_LIBFDT)
+	boot_fdt_add_mem_rsv_regions(lmb, *of_flat_tree);
+#endif
+
 	/* allocate space and init command line */
 	ret = boot_cmdline_linux(images);
 	if (ret)