Move the definition of switchable filter numbers into enum
INTERP_FILTER; Modify the macro ADD_MV_REF_LIST and
IF_DIFF_REF_FRAME_ADD_MV.

Change-Id: Ic36c9eb6ccb8ec324d991f7241e42b40b60b1dcb
Combine vp9_encode_block_intra and encode_block_intra

Change-Id: I79091fb677b64892ecca2fb466fde14602d8cdfc
Merge "Combine vp9_encode_block_intra and encode_block_intra"
Merge "Move the definition of switchable filter numbers into enum INTERP_FILTER; Modify the macro ADD_MV_REF_LIST and IF_DIFF_REF_FRAME_ADD_MV."