drivers/virt: add missing linux/interrupt.h to fsl_hypervisor.c

fsl_hypervisor.c calls request_irq() but does not include linux/interrupt.h.
Normally, the driver will compile without error, but it can fail on some
configurations.
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

drivers/virt/fsl_hypervisor.c

@@ -37,6 +37,7 @@
 #include <linux/reboot.h>
 #include <linux/uaccess.h>
 #include <linux/notifier.h>
+#include <linux/interrupt.h>
 
 #include <linux/io.h>
 #include <asm/fsl_hcalls.h>