gpu: host1x: Remove unnecessary include

Nothing from the asm/mach/irq.h header is needed in this file, so there
is no need to include it.
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/host1x/hw/intr_hw.c

@@ -20,7 +20,6 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/io.h>
-#include <asm/mach/irq.h>
 
 #include "../intr.h"
 #include "../dev.h"