ivi-shell: move event_mask to properties struct

I moved the event_mask to ivi_layout_*_properties struct,
so that it is easily accessible with get_properties_of_*
APIs.

Signed-off-by: Emre Ucan <eucan@de.adit-jv.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
diff --git a/ivi-shell/ivi-layout-export.h b/ivi-shell/ivi-layout-export.h
index e4edd3b..b6ece2c 100644
--- a/ivi-shell/ivi-layout-export.h
+++ b/ivi-shell/ivi-layout-export.h
@@ -84,6 +84,7 @@
 	bool visibility;
 	int32_t transition_type;
 	uint32_t transition_duration;
+	uint32_t event_mask;
 };
 
 struct ivi_layout_layer_properties
@@ -104,6 +105,7 @@
 	double start_alpha;
 	double end_alpha;
 	uint32_t is_fade_in;
+	uint32_t event_mask;
 };
 
 enum ivi_layout_notification_mask {