Don't use extra lines for r=2 guided filter
Changes the CONFIG_FAST_SGR=1 strategy to not use any subsampling for the r=1 filter, but for the r=2 filter sub-sample vertically but combine only by filtering horizontally in the last stage for odd rows. Coding efficiency loss sems quite minimal. Change-Id: I5644ac400b387c37a2d278db7f6ad3ac0a6b5e93
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