ipa: ipu3: Tidy-up includes

Tidy-up a bit the inclusions directive in the IPU3 IPA module.

In detail:
- ipu3.cpp is missing inclusions for:
  std::abs from <cmath>
  std::map from <map>
  std::min/max from <algorithm>
  std::numeric_limits from <limits>
  std::unique_ptr from <memory>
  std::vector from <vector>

  and does not require <sys/mman.h>

- ipu3_agc has two not used inclusions in the header file and one the cpp file
  and is missing <chrono> for std::literals::chrono_literals

- ipu3_awb is missing <algorithm> for std::sort and does not use
  <numeric> or <unordered_map>

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

src/ipa/ipu3/ipu3_agc.cpp

@@ -8,8 +8,8 @@
 #include "ipu3_agc.h"
 
 #include <algorithm>
+#include <chrono>
 #include <cmath>
-#include <numeric>
 
 #include <libcamera/base/log.h>