don't use ttyAMA0 console on all aarch64, just qemu

devices/qemu-aarch64/default.nix

@@ -42,6 +42,9 @@
         SERIAL_AMBA_PL011_CONSOLE = "y";
       };
     };
+    boot.commandLine = [
+      "console=ttyAMA0,38400"
+    ];
     hardware =
       let
         mac80211 =  pkgs.mac80211.override {

modules/arch/aarch64.nix

@@ -6,14 +6,11 @@
       CPU_BIG_ENDIAN= "n";
       # CMDLINE_FROM_BOOTLOADER availability is conditional
       # on CMDLINE being set to something non-empty
-      CMDLINE="\"console=ttyAMA0\"";
+      CMDLINE="\"empty=false\"";
       CMDLINE_FROM_BOOTLOADER = "y";
 
       OF = "y";
       # USE_OF = "y";
     };
-    boot.commandLine = [
-      "console=ttyAMA0,38400"
-    ];
   };
 }