fix(greylag): disable USB autosuspend

Sometimes TLP has an issue where it incorrectly disables my USB devices
while I am still using them. This is a pain, as it means that I can no
longer use my computer without un-suspending them.

Let's disable the buggy feature so this is no longer a problem, the power
tradeoff is likely negligible in comparison to the convenience I will
gain

Change-Id: Ic3e3a770c43507dcde8d0a8df1f4657904401b8e
diff --git a/systems/x86_64-linux/greylag/firmware/default.nix b/systems/x86_64-linux/greylag/firmware/default.nix
index 40ae097..124246c 100644
--- a/systems/x86_64-linux/greylag/firmware/default.nix
+++ b/systems/x86_64-linux/greylag/firmware/default.nix
@@ -2,4 +2,5 @@
 
 {
   services.fwupd.enable = true;
+  services.tlp.settings.USB_AUTOSUSPEND = 0;
 }