rename CFG_ macros to CONFIG_SYS

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/drivers/mtd/spi/stmicro.c b/drivers/mtd/spi/stmicro.c
index c999b12..b8b835a 100644
--- a/drivers/mtd/spi/stmicro.c
+++ b/drivers/mtd/spi/stmicro.c
@@ -295,7 +295,7 @@
 		}
 
 		/* Up to 2 seconds */
-		ret = stmicro_wait_ready(flash, 2 * CFG_HZ);
+		ret = stmicro_wait_ready(flash, 2 * CONFIG_SYS_HZ);
 		if (ret < 0) {
 			debug("SF: STMicro page erase timed out\n");
 			break;