mips: Use memblock to reserve the __nosave memory range

Originally before legacy bootmem was removed, the memory for the range was
correctly reserved by reserve_bootmem_region(). But since memblock has been
selected for early memory allocation the function can be utilized only
after paging is fully initialized (as it is done by memblock_free_all()
function). So calling it from arch_mem_init() method is prone to errors,
and at this stage we need to reserve the memory in the memblock allocator.

Signed-off-by: Serge Semin <[email protected]>
Signed-off-by: Paul Burton <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: James Hogan <[email protected]>
Cc: Matt Redfearn <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Stefan Agner <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Cc: Alexandre Belloni <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: [email protected]
Cc: [email protected]

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