android: camera_stream: Add CameraStream::Type

Define the CameraStream::Type enumeration and assign it to
each CameraStream instance at construction time.

The CameraStream type will be used to decide if memory needs to be
allocated on its behalf or if the stream is backed by memory externally
allocated by the Android framework.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

src/android/camera_stream.cpp

@@ -12,7 +12,7 @@
 using namespace libcamera;
 
 CameraStream::CameraStream(PixelFormat format, Size size,
-			   unsigned int index, Encoder *encoder)
-	: format_(format), size_(size), index_(index), encoder_(encoder)
+			   Type type, unsigned int index, Encoder *encoder)
+	: format_(format), size_(size), type_(type), index_(index), encoder_(encoder)
 {
 }