Camera flash control - version for iOS/OS X

AVCaptureDevice has API to work with camera flash on both iOS and OS X
(quite limited on OS X though) - so camera flash control can be implemented
in AVFoundation plugin.

Task-number: QTBUG-37996
Change-Id: Ie9aaed09a709e7d09ccc1cedded93a69fea93975
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

src/plugins/avfoundation/camera/camera.pro

@@ -41,7 +41,8 @@ HEADERS += \
     avfcameraexposurecontrol.h \
     avfcamerautility.h \
     avfcameraviewfindersettingscontrol.h \
-    avfimageencodercontrol.h
+    avfimageencodercontrol.h \
+    avfcameraflashcontrol.h
 
 OBJECTIVE_SOURCES += \
     avfcameraserviceplugin.mm \
@@ -62,7 +63,8 @@ OBJECTIVE_SOURCES += \
     avfcameraexposurecontrol.mm \
     avfcamerautility.mm \
     avfcameraviewfindersettingscontrol.mm \
-    avfimageencodercontrol.mm
+    avfimageencodercontrol.mm \
+    avfcameraflashcontrol.mm
 
 ios {