arm: implement getfp

*** 60,70 ****
  STUB(copyinstr_noerr)
  STUB(audit)
  STUB(cas32)
  STUB(cas64)
  STUB(copyoutstr)
- STUB(getfp)
  STUB(htonl)
  STUB(htons)
  STUB(indir)
  STUB(idmap_reg_dh)
  STUB(kcopy)
--- 60,69 ----