MdeModulePkg/DriverSampleDxe: Uninstall the ConfigAccess protocol

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>

MdeModulePkg/Universal/DriverSampleDxe/DriverSample.c

@@ -2278,6 +2278,8 @@ DriverSampleUnload (
             DriverHandle[1],
             &gEfiDevicePathProtocolGuid,
             &mHiiVendorDevicePath1,
+            &gEfiHiiConfigAccessProtocolGuid,
+            &mPrivateData->ConfigAccess,
             NULL
            );
     DriverHandle[1] = NULL;