mpc83xx: MPC837XERDB: Add PCIe support On MPC8377E-RDB and MPC8378E-RDB boards we have PCIe and mini-PCIe slots. Let's support them. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Kim Phillips <kim.phillips@freescale.com>