fix(hwaccel): remove ROCm install from AMD APU setup (#12958)

AMD APUs (Radeon 780M/760M/740M and similar integrated graphics) do not
benefit from the full ROCm compute stack in LXC containers. ROCm is a
multi-GB GPGPU framework primarily designed for discrete AMD GPUs and
ML/AI workloads, not for video transcoding with integrated graphics.

For APUs the Mesa VA-API drivers (mesa-va-drivers, mesa-opencl-icd) and
firmware (firmware-amd-graphics) provide all the hardware acceleration
needed for media tasks. Installing ROCm on top adds ~4GB of packages
that frequently fail or time out for this class of hardware.

Discrete AMD GPUs (GPU_TYPE=AMD) are unaffected and still receive ROCm.

misc/tools.func

@@ -4629,9 +4629,6 @@ _setup_amd_apu() {
     $STD apt -y install firmware-amd-graphics 2>/dev/null || true
   fi
 
-  # ROCm compute stack (OpenCL + HIP) - also works for many APUs
-  _setup_rocm "$os_id" "$os_codename"
-
   msg_ok "AMD APU configured"
 }