Enhance GPT to remove the assumption that GPT partition entry in PMBR must be the first partition entry.
Enhance GPT to remove the assumption that GPT partition entry in PMBR must be the first partition entry.

git-svn-id: 5648d1bec6962b0a6d1d1b40eba8cf5cdb62da3d@9069 6f19259b-4bc3-4df7-8a09-765794883524

MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2