ARM: OMAP: DSPGW: fix build warning

Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>

arch/arm/plat-omap/dsp/ipbuf.c

@@ -23,6 +23,7 @@
 
 #include <linux/sched.h>
 #include <linux/device.h>
+#include <linux/interrupt.h>
 #include <asm/arch/mailbox.h>
 #include "dsp_mbcmd.h"
 #include "dsp.h"