Convert CONFIG_CMD_AES et al to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_AES
   CONFIG_AES

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Add select AES to CMD_AES]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/seaboard_defconfig b/configs/seaboard_defconfig
index 3e5549c..9e50f70 100644
--- a/configs/seaboard_defconfig
+++ b/configs/seaboard_defconfig
@@ -38,3 +38,4 @@
 CONFIG_DM_VIDEO=y
 CONFIG_VIDEO_TEGRA20=y
 CONFIG_CONSOLE_SCROLL_LINES=10
+CONFIG_AES=y