libcamera: Stop using Stream::bufferPool to get the number of buffers

The cam and qcam applications, as well as the camera capture test case,
access the Stream::bufferPool in order to know how many requests to
initially queue. As part of an effort to remove access to the buffer
pool from applications, use the buffer count from the stream
configuration instead.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

test/camera/capture.cpp

@@ -80,9 +80,8 @@ protected:
 		}
 
 		Stream *stream = cfg.stream();
-		BufferPool &pool = stream->bufferPool();
 		std::vector<Request *> requests;
-		for (unsigned int i = 0; i < pool.count(); ++i) {
+		for (unsigned int i = 0; i < cfg.bufferCount; ++i) {
 			Request *request = camera_->createRequest();
 			if (!request) {
 				cout << "Failed to create request" << endl;