android: Make shutdown timeout shorter

Android L is using 8 seconds for both enable and disable timeouts.
Set daemon shutdown timeout to 5 seconds to make sure we fit into
framework timeout in case things go wrong.

android/main.c

@@ -70,7 +70,7 @@
 #define DEFAULT_NAME "BlueZ for Android"
 
 #define STARTUP_GRACE_SECONDS 5
-#define SHUTDOWN_GRACE_SECONDS 10
+#define SHUTDOWN_GRACE_SECONDS 5
 
 static char *config_vendor = NULL;
 static char *config_model = NULL;