qemu: move rtc to microvm machine type

Closes #458

Author: SuperSandro2000

lib/runners/qemu.nix

@@ -98,11 +98,11 @@ let
         inherit accel;
         mem-merge = "on";
         acpi = "on";
-        rtc = "on";
       } // lib.optionalAttrs (machine == "microvm") {
         pit = "off";
         pic = "off";
         pcie = if requirePci then "on" else "off";
+        rtc = "on";
         usb = if requireUsb then "on" else "off";
       };
       aarch64-linux = {