libcamera: Remove libcamera class

The class was just a placeholder, now that we have other objects
defined, remove it along with the associated test.

The libcamera/libcamera.h header is kept as a shortcut to include the
whole libcamera public API.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

include/libcamera/libcamera.h

@@ -10,14 +10,4 @@
 #include <libcamera/camera.h>
 #include <libcamera/camera_manager.h>
 
-namespace libcamera {
-
-class libcamera
-{
-public:
-	void init_lib(void);
-};
-
-};
-
 #endif /* __LIBCAMERA_LIBCAMERA_H__ */