common: Use new numeric setenv functions

Use setenv_ulong(), setenv_hex() and setenv_addr() in common/

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/cmd_nand.c b/common/cmd_nand.c
index 495610c..32348f3 100644
--- a/common/cmd_nand.c
+++ b/common/cmd_nand.c
@@ -373,7 +373,6 @@
 {
 	nand_info_t *nand = &nand_info[idx];
 	struct nand_chip *chip = nand->priv;
-	char buf[32];
 
 	printf("Device %d: ", idx);
 	if (chip->numchips > 1)
@@ -385,14 +384,9 @@
 	printf("  Erase size %8d b\n", nand->erasesize);
 
 	/* Set geometry info */
-	sprintf(buf, "%x", nand->writesize);
-	setenv("nand_writesize", buf);
-
-	sprintf(buf, "%x", nand->oobsize);
-	setenv("nand_oobsize", buf);
-
-	sprintf(buf, "%x", nand->erasesize);
-	setenv("nand_erasesize", buf);
+	setenv_hex("nand_writesize", nand->writesize);
+	setenv_hex("nand_oobsize", nand->oobsize);
+	setenv_hex("nand_erasesize", nand->erasesize);
 }
 
 static int raw_access(nand_info_t *nand, ulong addr, loff_t off, ulong count,