[MIPS] Fix sparsemem support.

Move memory_present() in arch/mips/kernel/setup.c. When using sparsemem
extreme, this function does an allocate for bootmem. This would always
fail since init_bootmem hasn't been called yet.
    
Move memory_present after free_bootmem. This only marks actual memory
ranges as present instead of the entire address space.
    
Signed-off-by: Chad Reese  <creese@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/setup.c

@@ -355,8 +355,6 @@ static inline void bootmem_init(void)
 	}
 #endif
 
-	memory_present(0, first_usable_pfn, max_low_pfn);
-
 	/* Initialize the boot-time allocator with low memory only.  */
 	bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
 
@@ -410,6 +408,7 @@ static inline void bootmem_init(void)
 
 		/* Register lowmem ranges */
 		free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
+		memory_present(0, curr_pfn, curr_pfn + size - 1);
 	}
 
 	/* Reserve the bootmap memory.  */