microblaze: Add support for reserved memory defined by DT

In DT reserved memory nodes can be added as is described by
Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
but Microblaze didn't have a support for it. The similar change was done
for ARC by commit 1b10cb21d888 ("ARC: add support for reserved memory
defined by device tree"). It is pretty much enough to call
early_init_fdt_scan_reserved_mem().
Microblaze is not using initial_boot_params that's why there is no need to
call early_init_fdt_reserve_self().

Signed-off-by: Michal Simek <[e-mail]>
Link: https://lore.kernel.org/r/da43[e-mail]

arch/microblaze/mm/init.c

···
 #include <linux/kernel.h>
 #include <linux/mm.h> /* mem_init */
 #include <linux/initrd.h>
+#include <linux/of_fdt.h>
 #include <linux/pagemap.h>
 #include <linux/pfn.h>
 #include <linux/slab.h>
···
 	memblock_set_current_limit(memory_start + lowmem_size - 1);
 
 	parse_early_param();
+
+	early_init_fdt_scan_reserved_mem();
 
 	/* CMA initialization */
 	dma_contiguous_reserve(memory_start + lowmem_size - 1);