VAAPI: fix hevc interop test

[lrusak]

In light of changes present in mesa 17.2.x it seems that they have become more strict or it was just working by chance before.

before:

(gdb) print image
 = {image_id = 167772160, format = {fourcc = 842094169, byte_order = 1, bits_per_pixel = 12, depth = 0, red_mask = 0, green_mask = 0, 
    blue_mask = 0, alpha_mask = 0}, buf = 134217728, width = 1920, height = 1080, data_size = 3133440, num_planes = 3, pitches = {1920, 
    960, 960}, offsets = {0, 2088960, 2611200}, num_palette_entries = 0, entry_bytes = 0, component_order = 000000000}

after:

(gdb) print image
 = {image_id = 167772160, format = {fourcc = 808530000, byte_order = 1, bits_per_pixel = 24, depth = 0, red_mask = 0, green_mask = 0, 
    blue_mask = 0, alpha_mask = 0}, buf = 134217728, width = 1920, height = 1080, data_size = 6266880, num_planes = 2, pitches = {3840, 
    3840, 0}, offsets = {0, 4177920, 0}, num_palette_entries = 0, entry_bytes = 0, component_order = 000000000}

Thanks to the guys in #dri-devel for helping out on this one

[lrusak]

jenkins build and merge