test: v4l2_device: Rename dev_ to capture_

Change the variable name globally throughout the tests.

Repair the V4L2DeviceTest constructor style, as checkstyle complained.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

test/v4l2_device/request_buffers.cpp

@@ -21,7 +21,7 @@ protected:
 
 		pool_.createBuffers(bufferCount);
 
-		int ret = dev_->exportBuffers(&pool_);
+		int ret = capture_->exportBuffers(&pool_);
 		if (ret)
 			return TestFail;