Minor fix on GPIO initialization (#113)

This PR fixes an error message that showed up during `hello-world`
container:

~~~bash
E: GPIO system not initialized or invalid module 0x20004f70
~~~

Signed-off-by: Federico Roux <rouxfederico@gmail.com>

Author: fgr-17

src/ocre/components/container_supervisor/cs_sm_impl.c

@@ -295,6 +295,9 @@ ocre_container_runtime_status_t CS_runtime_init(ocre_cs_ctx *ctx, ocre_container
 #ifdef CONFIG_OCRE_TIMER
 	ocre_timer_init();
 #endif
+#ifdef CONFIG_OCRE_GPIO
+	ocre_gpio_init();
+#endif
 #ifdef CONFIG_OCRE_CONTAINER_MESSAGING
 	ocre_messaging_init();
 #endif