Another prep work to enable partitionining
Created by: ycho
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Add update_partition_context() function.
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Add partition_context_lookup[] and subsize_lookup[] tables.
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Add mi_size_wide[] and mi_size_high[] tables.
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Fix outdated lookup tables, for ex: all 2x2, 4x2, 2x4 are dropped.
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Use BLOCK_SIZES_ALL whenever possible for the size of lookup table.
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As a separate commit for submodule libaom, manually update the corresponding lookup tables, esp. all the tables with the size BLOCK_SIZES_ALL.