blackfin: bf60x: Rename the DDR controller macro

Rename the DDR controller macro from DDR0 to DMC0 to avoid confustion for
bf60x.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index d0246de..0053e1b 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -856,7 +856,7 @@
 		ret *= 2;
 	return ret;
 #elif defined(CONFIG_BF60x)
-	u32 ddrctl = bfin_read_DDR0_CFG();
+	u32 ddrctl = bfin_read_DMC0_CFG();
 	int ret;
 	switch (ddrctl & 0xf00) {
 	case DEVSZ_64: