KVM: VFIO: deduplicate file release logic

There are two callsites which destroy files in kv->file_list: the
function servicing KVM_DEV_VFIO_FILE_DEL, and the relase of the whole
KVM VFIO device. The process involves several steps, so move all those
into a single function, removing duplicate code.

Signed-off-by: Carlos López <clopez@suse.de>
Reviewed-by: Alex Williamson <alex@shazbot.org>
Link: https://patch.msgid.link/20260313122040.1413091-6-clopez@suse.de
Signed-off-by: Sean Christopherson <seanjc@google.com>

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