m68k: mcf5445x: allow CS0 to be undefined

On some boards, CONFIG_SYS_CS0_BASE can be undefined, since
CS0 is not connected to any signal.

Signed-off-by: Angelo Dureghello <angelo@sysam.it>
diff --git a/arch/m68k/cpu/mcf5445x/cpu_init.c b/arch/m68k/cpu/mcf5445x/cpu_init.c
index b4a8eef..5d2b116 100644
--- a/arch/m68k/cpu/mcf5445x/cpu_init.c
+++ b/arch/m68k/cpu/mcf5445x/cpu_init.c
@@ -205,6 +205,7 @@
 	/* FlexBus Chipselect */
 	init_fbcs();
 
+#ifdef CONFIG_SYS_CS0_BASE
 	/*
 	 * now the flash base address is no longer at 0 (Newer ColdFire family
 	 * boot at address 0 instead of 0xFFnn_nnnn). The vector table must
@@ -212,6 +213,7 @@
 	 */
 	if (CONFIG_SYS_CS0_BASE != 0)
 		setvbr(CONFIG_SYS_CS0_BASE);
+#endif
 
 	icache_enable();
 }