Keep StdErr same logic initialization with ConOut, e.g. initialize...

Keep StdErr same logic initialization with ConOut, e.g. initialize gST->StandardErrorHandle and gST->StdErr in Consplitter entrypoint.

Signed-off-by: Li Elvin <elvin.li@intel.com>
Reviewed-by: Sun Rui <rui.sun@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13190 6f19259b-4bc3-4df7-8a09-765794883524