MdeModulePkg: Fix parameter verification for SetAttribute

Check for 8th bit being reserved as per UEFI spec.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jaben Carsey <Jaben.carsey@intel.com>
Reviewed-by: Erik Bjorge <erik.c.bjorge@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Elvin Li <elvin.li@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg@15680 6f19259b-4bc3-4df7-8a09-765794883524