microblaze: add parameter to microblaze_read()

This patch modifies parameter of microblaze_read() from 'void' to 'struct
clocksource *cs', which fixes compile warning for incompatible parameter type.
Signed-off-by: Coly Li <coly.li@suse.de>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/kernel/timer.c

@@ -176,7 +176,7 @@ static __init void microblaze_clockevent_init(void)
 	clockevents_register_device(&clockevent_microblaze_timer);
 }
 
-static cycle_t microblaze_read(void)
+static cycle_t microblaze_read(struct clocksource *cs)
 {
 	/* reading actual value of timer 1 */
 	return (cycle_t) (in_be32(TIMER_BASE + TCR1));