nshlib: Remove the remaining CONFIG_FILE_STREAM dependence

continue the change from https://github.com/apache/nuttx-apps/pull/1559

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

nshlib/nsh_dbgcmds.c

@@ -27,6 +27,7 @@
 #include <sys/types.h>
 #include <stdint.h>
 #include <stdbool.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>