Fix build break in OvmfPkgIa32X64.dsc where gEfiSecurityPkgTokenSpaceGuid was no...

Fix build break in OvmfPkgIa32X64.dsc where gEfiSecurityPkgTokenSpaceGuid was no longer found.

It is declared in SecurityPkg.dec, but with the latest build tools, since this package builds multiple architectures (IA32 & X64) and there are no IA32 modules used from the SecurityPkg, it is now necessary to place the gEfiSecurityPkgTokenSpaceGuid PCD's in a [PcdsFixedAtBuild.X64] section.

Signed-off-by: lee.g.rosenbaum@intel.com
Reviewed-by: erik.c.bjorge@intel.com
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13350 6f19259b-4bc3-4df7-8a09-765794883524