In DriverSampleInit, has installed the configAccess protocol to
the DriverHandle[1], but don't uninstall it in DriverSampleUnload.
Now uninstall the configAccess protocol.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>