refkit: update meta-intel-realsense

This is required because the old librealsense recipe no longer builds
from source (upstream git repo was reorganized).

* meta-intel-realsense 211ce75...50c6863 (2):
  > librealsense2: Add recipe for librealsense2 with Python support
  > librealsense: Restructure librealsense recipes in preparation for librealsense2

Signed-off-by: Patrick Ohly <[email protected]>

Author: pohly