[camera] disable auto focus when using front facing camera on Android (flutter#3383)

* Refactured Camera and fix issue front facing camera

* Update FPS range on Android to have correct brightness

* Formatted files

* Fix version conflict

Author: mvanbeusekom

packages/camera/camera/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.6.4+3
+
+* Detect if selected camera supports auto focus and act accordingly on Android. This solves a problem where front facing cameras are not capturing the picture because auto focus is not supported.
+
 ## 0.6.4+2
 
 * Set ImageStreamReader listener to null to prevent stale images when streaming images.