Updates div and divt forms generated with hfg

The commit replaces

* p1_to_p2_divt_[012]_[affine|blending]_q2.[ch]pp
  with
  p1_to_p2_divt_[affine|blending]_q2.[ch]pp

* p2_to_p1_div_[012]_[affine|blending]_q2.[ch]pp
  with
  p2_to_p1_div_[affine|blending]_q2.[ch]pp

* p1_div_[012]_[affine|blending]_q1.[ch]pp
  with
  p1_div_[affine|blending]_q1.[ch]pp

* p1_divt_[012]_[affine|blending]_q1.[ch]pp
  with
  p1_divt_[affine|blending]_q1.[ch]pp
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