aes: Add 'aes' command to access AES-128-CBC

Add simple 'aes' command, which allows using the AES-128-CBC encryption
and decryption functions from U-Boot command line.

Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/common/Makefile b/common/Makefile
index e2ff0cb..c49a0af 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -48,6 +48,7 @@
 obj-$(CONFIG_ENV_IS_NOWHERE) += env_nowhere.o
 
 # command
+obj-$(CONFIG_CMD_AES) += cmd_aes.o
 obj-$(CONFIG_CMD_AMBAPP) += cmd_ambapp.o
 obj-$(CONFIG_SOURCE) += cmd_source.o
 obj-$(CONFIG_CMD_SOURCE) += cmd_source.o