Changes to auto partition size selection.
Changes to code to auto select a partition size range based on data from spatial neighbors. Now looks at the sb_type in each 8x8 block of above and left SB64. The effect on speed 1 is now weaker giving better quality but less speed gain. Now also used in speed 2. Change-Id: Iace33a97d5c3498dd2a9a8a4067351941abcbabc