hw/i386/intel_iommu: Fix index calculation in vtd_interrupt_remap_msi()

hw/i386/intel_iommu: Fix index calculation in vtd_interrupt_remap_msi()

The values in "addr" are populated locally in this function in host
endian byte order, so we must not swap the index_l field here.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20230802135723.178083-5-thuth@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Xu <peterx@redhat.com>
(cherry picked from commit fcd8027423300b201b37842b88393dc5c6c8ee9e)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>