Fix compiler warnings for PPC systems. Update CHANGELOG.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/cpu/mpc86xx/spd_sdram.c b/cpu/mpc86xx/spd_sdram.c
index d57bcdf..265e033 100644
--- a/cpu/mpc86xx/spd_sdram.c
+++ b/cpu/mpc86xx/spd_sdram.c
@@ -1114,8 +1114,10 @@
 	int memsize_ddr1 = 0;
 	unsigned int law_size_ddr1;
 	volatile immap_t *immap = (immap_t *)CFG_IMMR;
-	volatile ccsr_ddr_t *ddr1 = &immap->im_ddr1;
 	volatile ccsr_local_mcm_t *mcm = &immap->im_local_mcm;
+#ifdef CONFIG_DDR_INTERLEAVE
+	volatile ccsr_ddr_t *ddr1 = &immap->im_ddr1;
+#endif
 
 #if (CONFIG_NUM_DDR_CONTROLLERS > 1)
 	int memsize_ddr2_dimm1 = 0;