Fix >4G issue on IDT not restored correctly.

Fix >4G issue on IDT not restored correctly.

Idtr might be changed inside of FSP. 32bit FSP only knows the <4G address.
If IDTR.Base is >4G, FSP can not handle. So we need save/restore IDTR here.
Interrupt is already disabled here, so it is safety to update IDTR.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <jiewen.yao@intel.com>
Reviewed-by: "Ma, Maurice" <maurice.ma@intel.com>
Reviewed-by: "Mudusuru, Giri P" <giri.p.mudusuru@intel.com>
Reviewed-by: "Yarlagadda, Satya P" <satya.p.yarlagadda@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19246 6f19259b-4bc3-4df7-8a09-765794883524