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/tqc/tqm85xx/tqm85xx.c b/board/tqc/tqm85xx/tqm85xx.c
index 277edcd..3931ec5 100644
--- a/board/tqc/tqm85xx/tqm85xx.c
+++ b/board/tqc/tqm85xx/tqm85xx.c
@@ -561,8 +561,7 @@
 	/* PORPLLSR[16] */
 	uint pci_clk_sel = gur->porpllsr & MPC85xx_PORDEVSR_PCI1_SPD;
 
-	uint pci_agent = (host_agent == 3) || (host_agent == 4 ) ||
-		(host_agent == 6);
+	uint pci_agent = is_fsl_pci_agent(LAW_TRGT_IF_PCI_1, host_agent);
 
 	uint pci_speed = CONFIG_SYS_CLK_FREQ;	/* PCI PSPEED in [4:5] */
 
@@ -630,11 +629,10 @@
 	uint host_agent = (gur->porbmsr & MPC85xx_PORBMSR_HA) >> 16;
 	volatile ccsr_fsl_pci_t *pci = (ccsr_fsl_pci_t *)CONFIG_SYS_PCIE1_ADDR;
 	struct pci_controller *hose = &pcie1_hose;
-	int pcie_ep =  (host_agent == 0) || (host_agent == 2 ) ||
-		(host_agent == 3);
+	int pcie_ep = is_fsl_pci_agent(LAW_TRGT_IF_PCIE_1, host_agent);
 	struct pci_region *r = hose->regions;
 
-	int pcie_configured  = io_sel >= 1;
+	int pcie_configured = is_fsl_pci_cfg(LAW_TRGT_IF_PCIE_1, io_sel);
 
 	if (pcie_configured && !(gur->devdisr & MPC85xx_DEVDISR_PCIE)){
 		printf ("PCIe:  %s, base address %x",