FSL PCIe controller can act as agent(EP) or host(RC).  Under Agent(EP) mode
the controller will be configured by the host system.  So its not required
to be registered with the PCI(e) sub-system. We only register the
controller if its configured in host(RC) mode.
Signed-off-by: NVivek Mahajan <vivek.mahajan@freescale.com>
Signed-off-by: NPrabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>