ppc/8xxx: Refactor code to determine if PCI is enabled & agent/host

Refactor the code into a simple bitmask lookup table that determines if
a given PCI controller is enabled and if its in host/root-complex or
agent/end-point mode.

Each processor in the PQ3/MPC86xx family specified different encodings
for the cfg_host_agt[] and cfg_IO_ports[] boot strapping signals.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/board/freescale/mpc8569mds/mpc8569mds.c b/board/freescale/mpc8569mds/mpc8569mds.c
index 63c21dd..cc88731 100644
--- a/board/freescale/mpc8569mds/mpc8569mds.c
+++ b/board/freescale/mpc8569mds/mpc8569mds.c
@@ -331,9 +331,9 @@
 
 	pci = (ccsr_fsl_pci_t *) CONFIG_SYS_PCIE1_ADDR;
 	hose = &pcie1_hose;
-	pcie_ep =  (host_agent == 0) || (host_agent == 2 ) || (host_agent == 3);
+	pcie_ep = is_fsl_pci_agent(LAW_TRGT_IF_PCIE_1, host_agent);
 	r = hose->regions;
-	pcie_configured  = io_sel >= 1;
+	pcie_configured = is_fsl_pci_cfg(LAW_TRGT_IF_PCIE_1, io_sel);
 
 	if (pcie_configured && !(gur->devdisr & MPC85xx_DEVDISR_PCIE)){
 		printf ("\n    PCIE connected to slot as %s (base address %x)",