microblaze: tag highmem_setup() with __meminit

With commit a0cd7a7c4bc0 ("mm: simplify free_highmem_page() and
free_reserved_page()") the kernel test robot complains about a warning:

WARNING: modpost: vmlinux.o(.text.unlikely+0x23ac): Section mismatch in
  reference from the function highmem_setup() to the function
  .meminit.text:memblock_is_reserved()

This has been broken ever since microblaze added highmem support,
because memblock_is_reserved() was already tagged with "__init" back then -
most probably the function always got inlined, so we never stumbled over
it.

We need __meminit because __init_memblock defaults to that without
CONFIG_ARCH_KEEP_MEMBLOCK" and __init_memblock is not used outside memblock
code.

Reported-by: kernel test robot <[email protected]>
Fixes: 2f2f371f8907 ("microblaze: Highmem support")
Cc: Andrew Morton <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Arvind Sankar <[email protected]>
Cc: Ira Weiny <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Signed-off-by: David Hildenbrand <[email protected]>
Reviewed-by: Oscar Salvador <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Michal Simek <[email protected]>

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