LoongArch: Add support for OUTPUT_FORMAT("binary")

LoongArch: Add support for OUTPUT_FORMAT("binary")

In binary output format, loongarch_elf_hash_table return NULL and result
in segment fault.

When ld output binary file, it seems that elf related functions should
not be called. But loongarch_elf_relax_section be called and
loongarch_elf_hash_table cause segment fault.

Just redefined loongarch_elf_hash_table and always return
link_info->hash.

The tests of binutils, glibc and gcc is ok.

0  loongarch_elf_relax_section ()
1  0x000055555557ab28 in lang_size_sections_1 ()
2  0x000055555557a16c in lang_size_sections_1 ()
3  0x000055555557b0a8 in one_lang_size_sections_pass ()
4  0x000055555557b478 in lang_size_sections ()
5  0x000055555557e65c in lang_relax_sections ()
6  0x000055555559f9c8 in ldelf_map_segments ()
7  0x000055555559783c in gldelf64loongarch_after_allocation ()
8  0x000055555558dac0 in ldemul_after_allocation ()
9  0x000055555557f6c0 in lang_process ()
10 0x0000555555585314 in main ()