As per the requirement, add a new Ini CFG_PCIE_CONFIG to
enable or disable externally. This Ini is used to control
pcie generation speed and lane width parameters to max value.
If enabled as of now this Ini makes generation as 3 and lanes
as 2 for pcie.
Change-Id: I96c1a133fa0b22d3b35a229b2fd9ba2904bb3d8f
CRs-Fixed: 3481707