env: common: Make the debug messages play a little nicer

Since we have global messages to indicate what's going on, the custom
messages in the environment drivers only make the output less readable.

Make the common code play a little nicer by removing all the extra output
in the standard case.

Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

env/common.c

@@ -78,7 +78,7 @@ void set_default_env(const char *s)
 			puts(s);
 		}
 	} else {
-		puts("Using default environment\n\n");
+		debug("Using default environment\n");
 	}
 
 	if (himport_r(&env_htab, (char *)default_environment,