arm64: dts: rockchip: Enable the missing av1d nodes

[nyanmisaka]

Required by the RKMPP AV1 hardware decoding in Chromium (libv4l-rkmpp), FFmpeg and Gstreamer.

The av1d and av1_mmu nodes are disabled by default as per https://github.com/armbian/linux-rockchip/blob/a93767dc2e9b0f29c33c080f77e8241208b9518a/arch/arm64/boot/dts/rockchip/rk3588s.dtsi#L4353-L4385

Tested with a few clips and it also works on Rock-5C.

root@rock-5c:~# dmesg | grep av1d
[   12.953757] rk_iommu fdca0000.iommu: av1d iommu enabled
[   13.567192] mpp_av1dec fdc70000.av1d: Adding to iommu group 14
[   13.567556] mpp_av1dec fdc70000.av1d: probing start
[   13.568110] mpp_av1dec fdc70000.av1d: probing finish

root@rock-5c:~# ./ffmpeg -hide_banner -hwaccel rkmpp -hwaccel_output_format drm_prime -afbc on -i ~/bbb_sunflower_1080p_30fps_normal_5min.mp4 -an -sn -f null -
...
Stream mapping:
  Stream #0:0 -> #0:0 (av1 (av1_rkmpp) -> wrapped_avframe (native))
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomav01dby1iso2mp41
    title           : Big Buck Bunny, Sunflower version
    artist          : Blender Foundation 2008, Janus Bager Kristensen 2013
    composer        : Sacha Goedegebure
    genre           : Animation
    comment         : Creative Commons Attribution 3.0 - http://bbb3d.renderfarming.net
    encoder         : Lavf60.16.100
  Stream #0:0(und): Video: wrapped_avframe, drm_prime(tv, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 30 fps, 30 tbn (default)
    Metadata:
      handler_name    : GPAC ISO Video Handler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc60.31.102 wrapped_avframe
[out#0/null @ 0xaaaad0006650] video:4219kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
frame= 9000 fps=242 q=-0.0 Lsize=N/A time=00:04:59.96 bitrate=N/A speed=8.08x