n1sdp: add GEN4 support for CCIX root complex

Merged Darryl Green requested to merge github/fork/manojkumar-arm/n1sdp/pcie-gen4-support into master

Created by: manojkumar-arm

This patch adds GEN4 link training support for CCIX root complex to support GEN4 cards in CCIX slot on N1SDP platform.

Change-Id: I73fc76c1575326017599634747cd15c151f9e08c Signed-off-by: Manoj Kumar manoj.kumar3@arm.com

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