PCI: qcom-ep: Reword the error message for receiving unknown global IRQ event

Current error message just prints the contents of PARF_INT_ALL_STATUS
register as if like the IRQ event number. It could mislead the users.
Reword it to make it clear that the error message is actually showing the
interrupt status register to help debug spurious IRQ events.

While at it, let's also switch over to dev_WARN_ONCE() so that any IRQ
storm won't flood the kernel log buffer.

Link: https://lore.kernel.org/linux-pci/20240828-pci-qcom-hotplug-v4-2-263a385fbbcb@linaro.orgSigned-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>

drivers/pci/controller/dwc/pcie-qcom-ep.c

@@ -679,7 +679,8 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data)
 		dw_pcie_ep_linkup(&pci->ep);
 		pcie_ep->link_status = QCOM_PCIE_EP_LINK_UP;
 	} else {
-		dev_err(dev, "Received unknown event: %d\n", status);
+		dev_WARN_ONCE(dev, 1, "Received unknown event. INT_STATUS: 0x%08x\n",
+			      status);
 	}
 
 	return IRQ_HANDLED;