env: Rename common functions related to setenv()

We are now using an env_ prefix for environment functions. Rename these
commonly used functions, for consistency. Also add function comments in
common.h.

Suggested-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/bootcount/bootcount_env.c b/drivers/bootcount/bootcount_env.c
index 7f22dd0..ec5f942 100644
--- a/drivers/bootcount/bootcount_env.c
+++ b/drivers/bootcount/bootcount_env.c
@@ -13,7 +13,7 @@
 	int upgrade_available = getenv_ulong("upgrade_available", 10, 0);
 
 	if (upgrade_available) {
-		setenv_ulong("bootcount", a);
+		env_set_ulong("bootcount", a);
 		env_save();
 	}
 }
diff --git a/drivers/net/fm/fm.c b/drivers/net/fm/fm.c
index 9fe34ad..451dfde 100644
--- a/drivers/net/fm/fm.c
+++ b/drivers/net/fm/fm.c
@@ -418,7 +418,7 @@
 	rc = fman_upload_firmware(index, &reg->fm_imem, addr);
 	if (rc)
 		return rc;
-	setenv_addr("fman_ucode", addr);
+	env_set_addr("fman_ucode", addr);
 
 	fm_init_muram(index, &reg->muram);
 	fm_init_qmi(&reg->fm_qmi_common);
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index f192ca5..1a65a3f 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -682,7 +682,7 @@
 
 	printf("Found %d device(s).\n", scsi_max_devs);
 #ifndef CONFIG_SPL_BUILD
-	setenv_ulong("scsidevs", scsi_max_devs);
+	env_set_ulong("scsidevs", scsi_max_devs);
 #endif
 	return 0;
 }