spl: input: Allow input in SPL and TPL

In some cases it is necessary to read the keyboard in early phases of
U-Boot. Update the config to allow this.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/input/input.c

@@ -652,7 +652,7 @@ int input_stdio_register(struct stdio_dev *dev)
 	int error;
 
 	error = stdio_register(dev);
-
+#if !defined(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(ENV_SUPPORT)
 	/* check if this is the standard input device */
 	if (!error && strcmp(env_get("stdin"), dev->name) == 0) {
 		/* reassign the console */
@@ -660,6 +660,9 @@ int input_stdio_register(struct stdio_dev *dev)
 				console_assign(stdin, dev->name))
 			return -1;
 	}
+#else
+	error = error;
+#endif
 
 	return 0;
 }