MdeModulePkg: Fix wrong check for SetAttribute in Consplitter
Original code check if Attribute > 0x7FFFFFFF, this is wrong and fail to check valid case per UEFI spec.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Elvin Li <elvin.li@intel.com>
Reviewed-by: Jaben Carsey <Jaben.carsey@intel.com>


git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg@15734 6f19259b-4bc3-4df7-8a09-765794883524