env: Drop saveenv() in favour of env_save()

Use the env_save() function directly now that there is only one
implementation of saveenv().

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Denk <wd@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>

drivers/bootcount/bootcount_env.c

@@ -6,6 +6,7 @@
  */
 
 #include <common.h>
+#include <environment.h>
 
 void bootcount_store(ulong a)
 {
@@ -13,7 +14,7 @@ void bootcount_store(ulong a)
 
 	if (upgrade_available) {
 		setenv_ulong("bootcount", a);
-		saveenv();
+		env_save();
 	}
 }