SPARC: Rename register maps from "*regset" to "*regmap"

SPARC: Rename register maps from "*regset" to "*regmap"

Clear the naming confusion about "regset" versus "sparc*regset".  The
latter was used to represent the *map* of a register set, not the
register set itself, and is thus renamed accordingly.

The following identifiers are renamed:

  sparc32_bsd_fpregset => sparc32_bsd_fpregmap
  sparc32_linux_core_gregset => sparc32_linux_core_gregmap
  sparc32_sol2_fpregset => sparc32_sol2_fpregmap
  sparc32_sol2_gregset => sparc32_sol2_gregmap
  sparc32_sunos4_fpregset => sparc32_sunos4_fpregmap
  sparc32_sunos4_gregset => sparc32_sunos4_gregmap
  sparc32nbsd_gregset => sparc32nbsd_gregmap
  sparc64_bsd_fpregset => sparc64_bsd_fpregmap
  sparc64_linux_core_gregset => sparc64_linux_core_gregmap
  sparc64_linux_ptrace_gregset => sparc64_linux_ptrace_gregmap
  sparc64_sol2_fpregset => sparc64_sol2_fpregmap
  sparc64_sol2_gregset => sparc64_sol2_gregmap
  sparc64fbsd_gregset => sparc64fbsd_gregmap
  sparc64nbsd_gregset => sparc64nbsd_gregmap
  sparc64obsd_core_gregset => sparc64obsd_core_gregmap
  sparc64obsd_gregset => sparc64obsd_gregmap
  sparc_fpregset => sparc_fpregmap
  sparc_gregset => sparc_gregmap
  sparc_sol2_fpregset => sparc_sol2_fpregmap
  sparc_sol2_gregset => sparc_sol2_gregmap

Also, all local variables 'gregset' and 'fpregset' are renamed to
'gregmap' and 'fpregmap', respectively.