serial: 8250_lpss: register DMA IRQ and pool with instance ID

It is really useful not only for debugging to have an DMA IRQ line and
pool being mapped to the corresponding IP by using its instance ID.

Provide PCI device and function as instance ID for Intel Quark UART DMA.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20190806094322.64987-7-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_lpss.c

@@ -170,6 +170,7 @@ static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
 
 	chip->pdata = &qrk_serial_dma_pdata;
 	chip->dev = &pdev->dev;
+	chip->id = pdev->devfn;
 	chip->irq = pci_irq_vector(pdev, 0);
 	chip->regs = pci_ioremap_bar(pdev, 1);
 	if (!chip->regs)