libcamera: Replace usage of lroundf() with std::lround()

As explained in the coding style document, usage of std::lround() is
preferred over lroundf() as it picks the correct function based on
the argument type. Replace calls to lroundf() with std::lround() through
libcamera.

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

src/libcamera/pipeline/vimc/vimc.cpp

@@ -6,9 +6,9 @@
  */
 
 #include <algorithm>
+#include <cmath>
 #include <iomanip>
 #include <map>
-#include <math.h>
 #include <tuple>
 
 #include <linux/media-bus-format.h>
@@ -420,7 +420,7 @@ int PipelineHandlerVimc::processControls(VimcCameraData *data, Request *request)
 			continue;
 		}
 
-		int32_t value = lroundf(it.second.get<float>() * 128 + offset);
+		int32_t value = std::lround(it.second.get<float>() * 128 + offset);
 		controls.set(cid, std::clamp(value, 0, 255));
 	}