libcamera: Drop the LIBCAMERA_D_PTR macro in favour of the _d() function

Now that all Extensible classes expose a _d() function that performs
appropriate casts, the LIBCAMERA_D_PTR brings no real additional value.
Replace it with direct calls to the _d() function.

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

include/libcamera/base/class.h

@@ -49,16 +49,12 @@ public:									\
 	friend class klass;						\
 	using Public = klass;
 
-#define LIBCAMERA_D_PTR()						\
-	_d();
-
 #define LIBCAMERA_O_PTR()						\
 	_o<Public>();
 
 #else
 #define LIBCAMERA_DECLARE_PRIVATE()
 #define LIBCAMERA_DECLARE_PUBLIC(klass)
-#define LIBCAMERA_D_PTR()
 #define LIBCAMERA_O_PTR()
 #endif