IntelSiliconPkg/dsc: Add PlatformVtd sample driver.
IntelSiliconPkg/dsc: Add PlatformVtd sample driver.

Cc: Star Zeng <5c6bb72efe464613af94e84c05522a361b23844a@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiewen Yao <364a90bfebd1f362ebb7b48e4bf8ec010adef203@intel.com>
Reviewed-by: Star Zeng <5c6bb72efe464613af94e84c05522a361b23844a@intel.com>

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