Consistent names for inverse hybrid transforms (2 of 2).

Renames:
  vp9_iht_add       -> vp9_iht4x4_add
  vp9_iht_add_8x8   -> vp9_iht8x8_add
  vp9_iht_add_16x16 -> vp9_iht16x16_add

Change-Id: I8f1a2913e02d90d41f174f27e4ee2fad0dbd4a21
4 files changed