winrt: add default capabilities

A module compiled for WinRT should define a default set of capabilities
to enable all features specified by the module.

Task-number: QTBUG-38802
Change-Id: I57c3aec60c72b1383b836cee2087b801196def1d
Reviewed-by: Oliver Wolff <oliver.wolff@theqtcompany.com>
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

src/multimedia/multimedia.pro

@@ -82,6 +82,10 @@ ANDROID_FEATURES += \
     android.hardware.camera.autofocus \
     android.hardware.microphone
 
+MODULE_WINRT_CAPABILITIES_DEVICE += \
+    microphone \
+    webcam
+
 win32: LIBS_PRIVATE += -luuid
 
 HEADERS += $$PUBLIC_HEADERS $$PRIVATE_HEADERS