Set SEC_SMALL_DATA on small common

Unlike the previous patch setting SEC_SMALL_DATA during
elf_backend_symbol_processing, this patch is mostly cosmetic.

	* elf32-frv.c (elf32_frv_add_symbol_hook): Set SEC_SMALL_DATA on
	small common section.
	* elf32-m32r.c (m32r_elf_add_symbol_hook): Likewise.
	* elf32-microblaze.c (microblaze_elf_add_symbol_hook): Likewise.
	* elf32-nds32.c (nds32_elf_add_symbol_hook): Likewise.
	* elf32-nios2.c (nios2_elf_add_symbol_hook): Likewise.
	* elf32-ppc.c (ppc_elf_add_symbol_hook): Likewise.
	* elf32-score.c (s3_bfd_score_elf_add_symbol_hook): Likewise.
	* elf32-score7.c (s7_bfd_score_elf_add_symbol_hook): Likewise.
	* elf32-tic6x.c (elf32_tic6x_add_symbol_hook): Likewise.
	* elf32-v850.c (v850_elf_check_relocs): Likewise.
	(v850_elf_add_symbol_hook): Likewise.
	* elf64-alpha.c (elf64_alpha_add_symbol_hook): Likewise.
	* elf64-ia64-vms.c (elf64_ia64_add_symbol_hook): Likewise.
	* elfnn-ia64.c (elfNN_ia64_add_symbol_hook): Likewise.
	* elfxx-mips.c (_bfd_mips_elf_add_symbol_hook): Likewise.