ath79: irqchip/ath79-misc: fix missing prototypes warnings

The newly introduced patch fixes the compilation warning for
kernel module irq-ath79-misc.

Signed-off-by: Shiji Yang <yangshiji66@outlook.com>

target/linux/ath79/patches-6.12/001-irqchip-ath79-misc-fix-missing-prototypes-warnings.patch

@@ -0,0 +1,55 @@
+From: Shiji Yang <yangshiji66@outlook.com>
+Date: Thu, 1 May 2025 01:59:06 +0800
+Subject: [PATCH] irqchip/ath79-misc: fix missing prototypes warnings
+
+ath79_misc_irq_init() was defined but unused since commit
+51fa4f8912c0 ("MIPS: ath79: drop legacy IRQ code"), so it's time
+to drop it. This patch also adds the missing header "asm/time.h"
+which defines the prototype of get_c0_perfcount_int().
+
+Fix the following warnings:
+
+drivers/irqchip/irq-ath79-misc.c:26:5: error: no previous prototype for 'get_c0_perfcount_int' [-Werror=missing-prototypes]
+   26 | int get_c0_perfcount_int(void)
+      |     ^~~~~~~~~~~~~~~~~~~~
+drivers/irqchip/irq-ath79-misc.c:181:13: error: no previous prototype for 'ath79_misc_irq_init' [-Werror=missing-prototypes]
+  181 | void __init ath79_misc_irq_init(void __iomem *regs, int irq,
+      |             ^~~~~~~~~~~~~~~~~~~
+
+Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
+---
+ drivers/irqchip/irq-ath79-misc.c | 19 +------------------
+ 1 file changed, 1 insertion(+), 18 deletions(-)
+
+--- a/drivers/irqchip/irq-ath79-misc.c
++++ b/drivers/irqchip/irq-ath79-misc.c
+@@ -10,6 +10,7 @@
+  *  Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
+  */
+ 
++#include <asm/time.h>
+ #include <linux/irqchip.h>
+ #include <linux/irqchip/chained_irq.h>
+ #include <linux/of_address.h>
+@@ -177,21 +178,3 @@ static int __init ar7240_misc_intc_of_in
+ 
+ IRQCHIP_DECLARE(ar7240_misc_intc, "qca,ar7240-misc-intc",
+ 		ar7240_misc_intc_of_init);
+-
+-void __init ath79_misc_irq_init(void __iomem *regs, int irq,
+-				int irq_base, bool is_ar71xx)
+-{
+-	struct irq_domain *domain;
+-
+-	if (is_ar71xx)
+-		ath79_misc_irq_chip.irq_mask_ack = ar71xx_misc_irq_mask;
+-	else
+-		ath79_misc_irq_chip.irq_ack = ar724x_misc_irq_ack;
+-
+-	domain = irq_domain_add_legacy(NULL, ATH79_MISC_IRQ_COUNT,
+-			irq_base, 0, &misc_irq_domain_ops, regs);
+-	if (!domain)
+-		panic("Failed to create MISC irqdomain");
+-
+-	ath79_misc_intc_domain_init(domain, irq);
+-}