rdn2cfg1/run_model: remove pcie_group_1

PCIe root complexes are removed from IO macro 1 and it has been
populated with non-pcie devices and hence pcie_group_1 model param has
been retired.

Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>
Change-Id: I95f0c6cc2e5dac35ef35e8d3af705b1b6448d30b