xtensa: irq: include <asm/traps.h>

Use <asm/traps.h> to provide the function prototype for do_IRQ()
to prevent a build warning:

arch/xtensa/kernel/irq.c:34:17: warning: no previous prototype for 'do_IRQ' [-Wmissing-prototypes]
   34 | asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs)
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Message-Id: <20230920052139.10570-4-rdunlap@infradead.org>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/kernel/irq.c

@@ -28,6 +28,7 @@
 #include <asm/mxregs.h>
 #include <linux/uaccess.h>
 #include <asm/platform.h>
+#include <asm/traps.h>
 
 DECLARE_PER_CPU(unsigned long, nmi_count);