sound: pxa2xx-ac97: include mach/irqs.h directly

In preparation of removing mach/irqs.h include from asm/irq.h, include
mach/irqs.h directly.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>

sound/arm/pxa2xx-ac97-lib.c

@@ -21,7 +21,7 @@
 #include <sound/ac97_codec.h>
 #include <sound/pxa2xx-lib.h>
 
-#include <asm/irq.h>
+#include <mach/irqs.h>
 #include <mach/regs-ac97.h>
 #include <mach/audio.h>