tuxedo/pulse/15/gen2: defer amdgpu secure display warning to Stage 2

Defer the amdgpu secure display warning from Stage 1 to Stage 2, despite
the initial decision [1] of reverting commit dd18dc7
("fix(tuxedo/pulse/15/gen2): prevent 'Secure display: Generic Failure'
warning") with commit 80d98a7 ("feat(tuxedo/pulse/15/gen2): use
default 'hardware.amdgpu.loadInInitrd'").

Since this noisy warning is an inherit property of this hardware,
deferring it is the desired behavior.

[1]: #755 (comment)

Author: trueNAHO

tuxedo/pulse/15/gen2/default.nix

@@ -11,6 +11,13 @@
     ../../../../common/pc/ssd
   ];
 
+  # Defer the following Stage 1 warning to Stage 2:
+  #
+  #     loading module amdgpu...
+  #     [...] amdgpu 0000:05:00.0: amdgpu: Secure display: Generic Failure.
+  #     [...] amdgpu 0000:05:00.0: amdgpu: SECUREDISPLAY: query securedisplay TA failed. ret 0x0
+  hardware.amdgpu.initrd.enable = false;
+
   services.udev.extraRules = builtins.concatStringsSep "\n" (
     [ "# Properly suspend the system." ]
     ++ (map