mpc83xx: add OF_FLAT_TREE bits to 83xx boards

add ft_pci_setup, OF_CPU, OF_SOC, OF_TBCLK, and
STDOUT_PATH configuration bits to mpc8349emds,
mpc8349itx, and mpc8360emds board code.

redo environment to use bootm with the fdtaddr
for booting ARCH=powerpc kernels by default,
and provide default fdtaddr values.
diff --git a/board/mpc8349emds/pci.c b/board/mpc8349emds/pci.c
index 93827f1..908be57 100644
--- a/board/mpc8349emds/pci.c
+++ b/board/mpc8349emds/pci.c
@@ -385,4 +385,26 @@
 
 }
 
+#ifdef CONFIG_OF_FLAT_TREE
+void
+ft_pci_setup(void *blob, bd_t *bd)
+{
+       	u32 *p;
+       	int len;
+
+       	p = (u32 *)ft_get_prop(blob, "/" OF_SOC "/pci@8500/bus-range", &len);
+       	if (p != NULL) {
+		p[0] = pci_hose[0].first_busno;
+		p[1] = pci_hose[0].last_busno;
+       	}
+
+#ifdef CONFIG_MPC83XX_PCI2
+	p = (u32 *)ft_get_prop(blob, "/" OF_SOC "/pci@8600/bus-range", &len);
+	if (p != NULL) {
+		p[0] = pci_hose[1].first_busno;
+		p[1] = pci_hose[1].last_busno;
+	}
+#endif
+}
+#endif /* CONFIG_OF_FLAT_TREE */
 #endif /* CONFIG_PCI */