platforms/rdn2cfg1: remove example pcie hierarchy 1

Example pcie hierarchy 1 was passed to io macro 1 to create a pcie
hierarchy. With 11.15 model, non-pcie devices are connected to io macro
1. So removed the example file.

Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>
Change-Id: Ie5bcce15642d48975039cc13a53913beb04cfd03