drivers/mtd/nand: Move conditional compilation to Makefile

rename CFG_NAND_LEGACY to CONFIG_NAND_LEGACY

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index ffb3169..1923310 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -25,15 +25,19 @@
 
 LIB	:= $(obj)libnand.a
 
+ifdef CONFIG_CMD_NAND
+ifndef CONFIG_NAND_LEGACY
 COBJS-y += nand.o
 COBJS-y += nand_base.o
-COBJS-y += nand_ids.o
-COBJS-y += nand_ecc.o
 COBJS-y += nand_bbt.o
+COBJS-y += nand_ecc.o
+COBJS-y += nand_ids.o
 COBJS-y += nand_util.o
+endif
 
 COBJS-$(CONFIG_NAND_FSL_ELBC) += fsl_elbc_nand.o
-COBJS-y += fsl_upm.o
+COBJS-$(CONFIG_NAND_FSL_UPM) += fsl_upm.o
+endif
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)