[Cin] New speed winner for hw tonemapping!

[Andrea paz]

My test with normal ffmpeg (no ffmpeg-git):

export RADV_PERFTEST=video_decode,video_encode
time -p ffmpeg -init_hw_device vulkan=vulkan -filter_hw_device vulkan
-hwaccel vulkan  -i hdr_02.mp4 -vf
libplacebo=w=1920:h=1080:force_original_aspect_ratio=decrease:normalize_sar=true:upscaler=ewa_lanczos:downscaler=ewa_lanczos:colorspace=bt709:color_primaries=bt709:color_trc=bt709:range=tv
-c:a copy -c:v libx264 -f mp4 -benchmark 2k.mp4

frame= 9504 fps= 89 q=-1.0 Lsize=  203650KiB time=00:02:38.52
bitrate=10523.9kbits/s speed=1.48x
bench: utime=1122.259s stime=49.945s rtime=106.762s
bench: maxrss=3372944KiB
real 106,91
user 1122,30
sys 50,01