tools: env: Add aes.c placeholder

Add missing aes.c placeholder which includes lib/aes.c . Without this
one, tools/env/ will fail to build.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Alexey Brodkin <Alexey.Brodkin@synopsys.com>
Cc: Masahiro Yamada <yamada.m@jp.panasonic.com>
Tested-by: Alexey Brodkin <abrodkin@synopsys.com>
Tested-by: Heiko Schocher <hs@denx.de>
diff --git a/tools/env/aes.c b/tools/env/aes.c
new file mode 100644
index 0000000..9e42679
--- /dev/null
+++ b/tools/env/aes.c
@@ -0,0 +1 @@
+#include "../../lib/aes.c"