fate/hevc: update fate with 9 bitstreams
- all of them testing HEVC version 1
x86/hevc_idct: replace old and unused idct functions

Only 8-bit and 10-bit idct_dc() functions are included (adding others
should be trivial).

Benchmarks on an Intel Core i5-4200U:

idct8x8_dc
      SSE2   MMXEXT  C
cycles 22     26      57

idct16x16_dc
      AVX2   SSE2    C
cycles 27     32      249

idct32x32_dc
      AVX2   SSE2    C
cycles 62     126     1375

Signed-off-by: James Almer <jamrial@gmail.com>