There are two issues here:
+ one is that misuse of memblock_reserve, memblock_reserve is allocating
memory (owned by kernel) for kernel use, but the misuse is reserving
memory (not owned by kernel). Actually, not memblock_add{,_note}ing
memory is right use of reserving memory not owned by kernel.
+ the other one is the using memblock_reserve without knowing whether the
memory is owned by kernel, but this is an issue for MIPS R2+, so just
bypass it;
