Remove un-used PPI reference.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>







git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16303 6f19259b-4bc3-4df7-8a09-765794883524