SMM PciExpressLib Instance

[Felix Poludov <Felixp@ami.com>]

Dear MdePkg maintainer,

MdePkg does not provide a specialized instance of PciExpressLib for SMM Drivers.
It provides Base instance that is typically used by SMM Drivers.
However, BasePciExpressLib calls PcdGet64 (PcdPciExpressBaseAddress) on every PCI-E access
and PcdPciExpressBaseAddress is declared in MdePkg.dec as a potentially dynamic token.
SMM Drivers cannot use BasePciExpressLib when PcdPciExpressBaseAddress is dynamic.
This patch adds SMM instance of PciExpressLib based on BasePciExpressLib.
The only difference from BasePciExpressLib is a constructor that caches PCD value into a local variable.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Felix Polyudov <felixp@ami.com<mailto:felixp@ami.com>>

Thanks
Felix

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