PurleySktPkg: Clean up duplicated SmramMemoryReserve.h files

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2108



SmramMemoryReserve.h has been added into
Edk2\MdePkg\Include\Guid\SmramMemoryReserve.h.

The duplicated header file can be cleaned up.
Edk2Platforms\Silicon\Intel\PurleySktPkg\Include\Guid\SmramMemoryReserve.h

Cc: Thad Gillispie <thad.gillispie@intel.com>
Cc: Daocheng Bu <daocheng.bu@intel.com>
Cc: Isaac W Oram <isaac.w.oram@intel.com>

Co-authored-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
Signed-off-by: Marc W Chen <marc.w.chen@intel.com>
Signed-off-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
Reviewed-by: Isaac Oram <isaac.w.oram@intel.com>
Reviewed-by: Daocheng Bu <daocheng.bu@intel.com>