gas, bfd, gold: Rename Arm v8/v9 architecture tags

Rename the Arm AEABI CPU architecture tag constants and macro definitions to include the
profile suffix for A-profile architectures. This makes the naming
consistent with existing v8-R and v8-M tag names, while preserving the
existing numeric tag values.

Update BFD, GAS and Gold usage accordingly, including attribute combination
tables, architecture checks, and mach selection.