u-boot: fit: add support to decrypt fit with aes

This commit add to u-boot the support to decrypt
fit image encrypted with aes. The FIT image contains
the key name and the IV name. Then u-boot look for
the key and IV in his device tree and decrypt images
before moving to the next stage.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/lib/Makefile b/lib/Makefile
index 6b7b9ce..51eba80 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -21,6 +21,7 @@
 obj-y += crypto/
 
 obj-$(CONFIG_AES) += aes.o
+obj-$(CONFIG_AES) += aes/
 obj-$(CONFIG_$(SPL_TPL_)BINMAN_FDT) += binman.o
 
 ifndef API_BUILD