[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>

include/asm-mips/sparsemem.h

@@ -0,0 +1,14 @@
+#ifndef _MIPS_SPARSEMEM_H
+#define _MIPS_SPARSEMEM_H
+#ifdef CONFIG_SPARSEMEM
+
+/*
+ * SECTION_SIZE_BITS		2^N: how big each section will be
+ * MAX_PHYSMEM_BITS		2^N: how much memory we can have in that space
+ */
+#define SECTION_SIZE_BITS       28
+#define MAX_PHYSMEM_BITS        35
+
+#endif /* CONFIG_SPARSEMEM */
+#endif /* _MIPS_SPARSEMEM_H */
+