Fixing a issue of calculating tx cost for SUPERTX+VAR_TX
Fixing a issue of calculating tx cost for SUPERTX+VAR_TX

Update blk_skip in update_state_supertx() and rd_supertx_sb().
Performance (SUPERTX+VAR_TX): TBD
(Eventually will merge update_state() and update_state_supertx())

Change-Id: I34ef982b80151ba2dfba745859cb2ca7b90dc888

GrokImageCompression/aom,mbebenita/aom,smarter/aom,smarter/aom,smarter/aom,mbebenita/aom,mbebenita/aom,smarter/aom,luctrudeau/aom,mbebenita/aom,mbebenita/aom,luctrudeau/aom,luctrudeau/aom,luctrudeau/aom,luctrudeau/aom,mbebenita/aom,smarter/aom,GrokImageCompression/aom,mbebenita/aom,GrokImageCompression/aom,smarter/aom,luctrudeau/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,mbebenita/aom,mbebenita/aom