RISC-V: Fix memblock_free() usages in init_resources()

RISC-V: Fix memblock_free() usages in init_resources()

`memblock_free()` takes a physical address as its first argument.
Fix the wrong usages in `init_resources()`.

Fixes: ec959da4fa47be32a3dce04a1932d311d214abf3 ("RISC-V: Improve init_resources()")
Fixes: f02fdec44409cd1b46c66fb9d955be01b3aae6cf ("RISC-V: Do not allocate memblock while iterating reserved memblocks")
Signed-off-by: Wende Tan <twd2.me@gmail.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>