[Fix] ivshmem does not support for interrupts when it is plain mode

[leiqi96]

No description provided.

[leiqi96]

if ivshmem type is plain mode ,it cannot register uio with some old linux version.

v2.6.32
uio_register_device()
if (idev->info->irq >= 0) {
ret = request_irq(idev->info->irq, uio_interrupt,
idev->info->irq_flags, idev->info->name, idev);
if (ret)
goto err_request_irq;
}

v3.17.8
uio_register_device()
if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) {
ret = devm_request_irq(idev->dev, info->irq, uio_interrupt,
info->irq_flags, info->name, idev);
if (ret)
goto err_request_irq;
}