Change obsolete method to compatible with API 21. Android 5.0 uses setPr...

...eviewTarget instead setPreviewTexture. It unbreks build on some omap4xxx devices.

Change-Id: I081e832ae9753ca8c79e9c59a8ff70d7f4ac07be

Signed-off-by: artas182x <artas182x@gmail.com>