chore(aquamarine): drop pcie_aspm=off

It was a precaution for the R9700 links, never an observed problem, and
on BIOS 1013 the FADT already disables ASPM ("ACPI FADT declares the
system doesn't support PCIe ASPM"), so the parameter did nothing.

Assisted-by: Claude Code (claude-opus-5-5)

outputs/x86_64-linux/tests/idols-aquamarine/expected.nix

@@ -4,7 +4,6 @@
   iommuPassthrough = true;
   runtimePmDisabled = true;
   gpuRecoveryEnabled = true;
-  aspmDisabled = true;
   deepCStatesAllowed = true;
   cpuEppConfigured = true;
   nativeIpv6Preference = true;

outputs/x86_64-linux/tests/idols-aquamarine/expr.nix

@@ -22,7 +22,6 @@ in
 
   # An unattended host recovers a hung card itself instead of waiting for a reboot.
   gpuRecoveryEnabled = builtins.elem "amdgpu.gpu_recovery=1" cfg.boot.kernelParams;
-  aspmDisabled = builtins.elem "pcie_aspm=off" cfg.boot.kernelParams;
   deepCStatesAllowed = !(builtins.elem "processor.max_cstate=2" cfg.boot.kernelParams);
   cpuEppConfigured =
     lib.attrByPath [