Should add two flags for slice limitation in tile mode

[HeJunyan]

For some drivers such as iHD, the slice partition has limitation. For example, the slice is not to allow span different tiles, and sometimes, one tile can contain only one slice.

Please add two flags for slice structure query:

VA_ENC_SLICE_STRUCTURE_NO_SPAN_TILE and VA_ENC_SLICE_STRUCTURE_ALIGNED_WITH_TILE