cpu/ppc4xx/fdt.c: avoid strcpy() to constant string

strcpy() was iused with the target address being a pointer to a
constant string, which potentially is read-only. Use a (writable)
array of characters instead.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/cpu/ppc4xx/fdt.c b/cpu/ppc4xx/fdt.c
index 496e028..b310832 100644
--- a/cpu/ppc4xx/fdt.c
+++ b/cpu/ppc4xx/fdt.c
@@ -42,7 +42,7 @@
 	u32 bxcr;
 	u32 ranges[EBC_NUM_BANKS * 4];
 	u32 *p = ranges;
-	char *ebc_path = "/plb/opb/ebc";
+	char ebc_path[] = "/plb/opb/ebc";
 
 	ft_cpu_setup(blob, bd);