Call tpl model build at the beginning of a GOP

The gop index 0 is default as kf / gf. The effective first coding
frame controlled by the current GOP rate allocation is indexed 1.
Call the tpl model build for the current GOP once at index 1
position. This would unify the calling system for single/multi-layer
ARF GOP structure.

Change-Id: I4ce69337e04646098d5513c0aa56b4e0b4483337
1 file changed