Use enum for target_register_timer_callback()

Change-Id: I268e8c5d783914aa97cbde301448b2c5bc3cb9e6
Signed-off-by: Marc Schink <openocd-dev@marcschink.de>
Reviewed-on: http://openocd.zylin.com/4921
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

src/target/cortex_a.c

@@ -2833,7 +2833,8 @@ static int cortex_a_init_arch_info(struct target *target,
 
 	/* REVISIT v7a setup should be in a v7a-specific routine */
 	armv7a_init_arch_info(target, armv7a);
-	target_register_timer_callback(cortex_a_handle_target_request, 1, 1, target);
+	target_register_timer_callback(cortex_a_handle_target_request, 1,
+		TARGET_TIMER_TYPE_PERIODIC, target);
 
 	return ERROR_OK;
 }