MdePkg: Support EFI_PEI_CORE_FV_LOCATION_PPI
    
    REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1524
    
    Add EFI_PEI_CORE_FV_LOCATION_PPI definition basing on
    PI spec 1.7, Section 6.3.9.
    This PPI can support the secnario that PEI Foundation
    not in BFV.
    
    Cc: Michael D Kinney <michael.d.kinney@intel.com>
    Cc: Liming Gao <liming.gao@intel.com>
    Contributed-under: TianoCore Contribution Agreement 1.1
    Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
    Reviewed-by: Star Zeng <star.zeng@intel.com>
    Reviewed-by: Liming Gao <liming.gao@intel.com>
    Reviewed-by: Ray Ni <ray.ni@intel.com>