native: added null check and remove EGL fallback

Change-Id: I589a1b0eae4c885ada1ee58a69bf2bcace822a45
native: go back to default heap sizes

causes on some devices to much problems. The one which want
to have a higher value can set it in device tree

Change-Id: Ie9fcd45ce5ea7ba34690c6c9d9320bb7b76bb7a5