Add back missing irq define for INT_34XX_BENCH_MPU_EMUL

Looks like we lost this at some point, add it back to sync
with mainline tree.
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/include/mach/irqs.h

@@ -303,6 +303,7 @@
 #define INT_243X_HS_USB_DMA	93
 #define INT_243X_CARKIT_IRQ	94
 
+#define INT_34XX_BENCH_MPU_EMUL	3
 #define INT_34XX_ST_MCBSP2_IRQ	4
 #define INT_34XX_ST_MCBSP3_IRQ	5
 #define INT_34XX_SSM_ABORT_IRQ	6