ath10k: Use platform_get_irq() to get the interrupt

platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
allocation of IRQ resources in DT core code, this causes an issue
when using hierarchical interrupt domains using "interrupts" property
in the node as this bypasses the hierarchical setup and messes up the
irq chaining.

In preparation for removal of static setup of IRQ resource from DT core
code use platform_get_irq().

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20211224192626.15843-8-prabhakar.mahadev-lad.rj@bp.renesas.com

drivers/net/wireless/ath/ath10k/snoc.c

@@ -1306,13 +1306,10 @@ static int ath10k_snoc_resource_init(struct ath10k *ar)
 	}
 
 	for (i = 0; i < CE_COUNT; i++) {
-		res = platform_get_resource(ar_snoc->dev, IORESOURCE_IRQ, i);
-		if (!res) {
-			ath10k_err(ar, "failed to get IRQ%d\n", i);
-			ret = -ENODEV;
-			goto out;
-		}
-		ar_snoc->ce_irqs[i].irq_line = res->start;
+		ret = platform_get_irq(ar_snoc->dev, i);
+		if (ret < 0)
+			return ret;
+		ar_snoc->ce_irqs[i].irq_line = ret;
 	}
 
 	ret = device_property_read_u32(&pdev->dev, "qcom,xo-cal-data",
@@ -1323,10 +1320,8 @@ static int ath10k_snoc_resource_init(struct ath10k *ar)
 		ath10k_dbg(ar, ATH10K_DBG_SNOC, "xo cal data %x\n",
 			   ar_snoc->xo_cal_data);
 	}
-	ret = 0;
 
-out:
-	return ret;
+	return 0;
 }
 
 static void ath10k_snoc_quirks_init(struct ath10k *ar)