camera: Reworked to operate with a driver interface, like other subsystems.

include/build_config/SDL_build_config_minimal.h

@@ -90,6 +90,6 @@ typedef unsigned int uintptr_t;
 #define SDL_FILESYSTEM_DUMMY  1
 
 /* Enable the camera driver (src/camera/dummy/\*.c) */
-#define SDL_CAMERA_DUMMY  1
+#define SDL_CAMERA_DRIVER_DUMMY  1
 
 #endif /* SDL_build_config_minimal_h_ */