migration: Remove spurious files

I introduced spurious files on my tree during a rebase:

commit ebfc578715
Author: Zhenzhong Duan <zhenzhong.duan@intel.com>
Date:   Mon Oct 17 15:53:51 2022 +0800

    multifd: Fix flush of zero copy page send request

    Make IO channel flush call after the inflight request has been drained
    in multifd thread, or else we may missed to flush the inflight request.

    Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
    Reviewed-by: Juan Quintela <quintela@redhat.com>
    Signed-off-by: Juan Quintela <quintela@redhat.com>

To make things worse, it appears like Zhenzhong is the one to blame.

for(int i=0; i < 1000000; i++) {
	printf("I will not do rebases when I am tired\n");
}

Sorry, Juan.

Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Juan Quintela <quintela@redhat.com>

configs/devices/x86_64-softmmu/x86_64-quintela-devices.mak

@@ -1,7 +0,0 @@
-# Boards:
-#
-CONFIG_ISAPC=n
-CONFIG_I440FX=n
-CONFIG_Q35=n
-CONFIG_MICROVM=y
-

configs/devices/x86_64-softmmu/x86_64-quintela2-devices.mak

@@ -1,6 +0,0 @@
-# Boards:
-#
-CONFIG_ISAPC=y
-CONFIG_I440FX=y
-CONFIG_Q35=y
-CONFIG_MICROVM=y