libs: encoder: h265: Add num-tile-cols/rows properties.
These properties are used for support of tile encoding. We just support uniform mode of tile encoding, that is, separating picture equally by (num-tile-cols X num-tile-rows). According to HEVC spec A1, the max number of tiles in column is 20 and in rows is 22, so add two constant definitions. Part-of: <!294>
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