android: mm: cros_camera_buffer: Drop undefined functions

The CameraBuffer::Private::planeAddr() functions are declared but not
defined (and of course not used). Drop them.

Fixes: d8d6a78f22 ("android: Introduce Chromium OS buffer manager")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

src/android/mm/cros_camera_buffer.cpp

@@ -42,9 +42,6 @@ private:
 		void *addr;
 		android_ycbcr ycbcr;
 	} mem;
-
-	const uint8_t *planeAddr(unsigned int plane) const;
-	uint8_t *planeAddr(unsigned int plane);
 };
 
 CameraBuffer::Private::Private(CameraBuffer *cameraBuffer,