hw/mem/cxl_type3: Add paired msix_uninit_exclusive_bar() call

hw/mem/cxl_type3: Add paired msix_uninit_exclusive_bar() call

msix_uninit_exclusive_bar() should be paired with msix_init_exclusive_bar()

Ensure proper resource cleanup by adding the missing
`msix_uninit_exclusive_bar()` call for the Type3 CXL device.

Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20250203161908.145406-3-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>