scripts/kernel-test/run-qemu.sh: update qemu args

Get rid of -nodefconfig, it has been removed in qemu 3.1. We are
supposed to use -no-user-config instead, which we already do.

Fix for this error we see since migrating to debian-bullseye:
  qemu-system-x86_64: -nodefconfig: invalid option

Related: OS#4969
Related: https://qemu.readthedocs.io/en/stable/about/removed-features.html#nodefconfig-removed-in-3-1
Change-Id: I4a00f90980bf6d141ef8d86786e08d405db6db0b

scripts/kernel-test/run-qemu.sh

@@ -23,7 +23,7 @@ qemu-system-x86_64 \
 	$MACHINE_ARG \
 	-smp 1 \
 	-m 512M \
-	-nodefconfig -no-user-config -nodefaults -display none \
+	-no-user-config -nodefaults -display none \
 	-gdb unix:/cache/kernel-test/gdb.pipe,server,nowait \
 	-no-reboot \
 	-kernel /cache/kernel-test/linux \