armv8: fsl-layerscape: fix config dependency for layerscape pci code

Fixes a link error on layerscape platform, linking fails with CONFIG_PCI
set and CONFIG_PCI_LAYERSCAPE unset.
Signed-off-by: NAlex Marginean <alexm.osslist@gmail.com>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
Reviewed-by: NPrabhakar Kushwaha <prabhakar.kushwaha@nxp.com>

arch/arm/cpu/armv8/fsl-layerscape/fdt.c

@@ -435,7 +435,7 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 	do_fixup_by_path_u32(blob, "/sysclk", "clock-frequency",
 			     CONFIG_SYS_CLK_FREQ, 1);
 
-#ifdef CONFIG_PCI
+#ifdef CONFIG_PCI_LAYERSCAPE
 	ft_pci_setup(blob, bd);
 #endif