libcamera: includes: Add missing includes

Let's add direct includes for classes currently included indirectly,
through other header files.

Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

include/libcamera/internal/request.h

@@ -10,6 +10,7 @@
 #include <chrono>
 #include <map>
 #include <memory>
+#include <unordered_set>
 
 #include <libcamera/base/event_notifier.h>
 #include <libcamera/base/timer.h>

include/libcamera/logging.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+#include <ostream>
+
 namespace libcamera {
 
 enum LoggingTarget {