ARM: s3c24xx: include mach/irqs.h where needed

Preparing for a later conversion to sparse IRQs, this ensures that
the mach/irqs.h header is still visible in files that reference
an IRQ number.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20200806182059.2431-30-krzk@kernel.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
diff --git a/arch/arm/mach-s3c24xx/simtec-usb.c b/arch/arm/mach-s3c24xx/simtec-usb.c
index 3488988..693a2a9 100644
--- a/arch/arm/mach-s3c24xx/simtec-usb.c
+++ b/arch/arm/mach-s3c24xx/simtec-usb.c
@@ -24,6 +24,7 @@
 #include <asm/mach/irq.h>
 
 #include <mach/gpio-samsung.h>
+#include <mach/irqs.h>
 #include <asm/irq.h>
 
 #include <linux/platform_data/usb-ohci-s3c2410.h>