libcamera: internal: Move SharedMemObject class to a common directory

Move SharedMemObject class out of RPi namespace and put it into
include/libcamera/internal so that everyone could use it.

Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> # sc8280xp Lenovo x13s
Tested-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/internal/meson.build

@@ -39,6 +39,7 @@ libcamera_internal_headers = files([
     'process.h',
     'pub_key.h',
     'request.h',
+    'shared_mem_object.h',
     'source_paths.h',
     'sysfs.h',
     'v4l2_device.h',

include/libcamera/internal/shared_mem_object.h

@@ -6,8 +6,8 @@
  */
 #pragma once
 
-#include <cstddef>
 #include <fcntl.h>
+#include <stddef.h>
 #include <string>
 #include <sys/mman.h>
 #include <sys/stat.h>
@@ -19,8 +19,6 @@
 
 namespace libcamera {
 
-namespace RPi {
-
 template<class T>
 class SharedMemObject
 {
@@ -123,6 +121,4 @@ private:
 	T *obj_;
 };
 
-} /* namespace RPi */
-
 } /* namespace libcamera */