MPC8272ADS: fix build error: 'bd_t' has no member named 'pci_clk'

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/cpu/mpc8260/pci.c b/cpu/mpc8260/pci.c
index 940f5c0..8230364 100644
--- a/cpu/mpc8260/pci.c
+++ b/cpu/mpc8260/pci.c
@@ -457,7 +457,7 @@
 void ft_pci_setup(void *blob, bd_t *bd)
 {
 	do_fixup_by_prop_u32(blob, "device_type", "pci", 4,
-		"clock-frequency", bd->pci_clk, 1);
+		"clock-frequency", gd->pci_clk, 1);
 }
 #endif