vulkan/video: add a h265 level translator.

This just converts the protocol level to the spec level encoding.

Reviewed-by: Hyunjun Ko <zzoon@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25874>

src/vulkan/runtime/vk_video.c

@@ -1357,4 +1357,13 @@ vk_video_get_h265_nal_unit(StdVideoH265PictureType pic_type, bool irap_pic_flag)
    return 0;
 }
 
+static const uint8_t vk_video_h265_levels[] = {10, 20, 21, 30, 31, 40, 41, 50, 51, 52, 60, 61, 62};
+
+static uint8_t
+vk_video_get_h265_level(StdVideoH265LevelIdc level)
+{
+   assert(level <= STD_VIDEO_H265_LEVEL_IDC_6_2);
+   return vk_video_h265_levels[level];
+}
+
 #endif