sh: Remove malloc_bin_reloc from lib_sh, lib_nios2 and lib_nios.

By "arm/microblaze/nios/nios2/sh: Remove relocation fixups"
(commit: 0630535e", doesn't need
malloc_bin_reloc function. This commit remove this.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>