Move defaults from config_cmd_default.h to Kconfig

This sets the default commands Kconfig to match
include/config_cmd_default.h commands in the common/Kconfig and removes
them from include/configs.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
[trini: rastaban, am43xx_evm_usbhost_boot, am43xx_evm_ethboot updates]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/io_defconfig b/configs/io_defconfig
index 9e0afee..722d95a 100644
--- a/configs/io_defconfig
+++ b/configs/io_defconfig
@@ -3,5 +3,4 @@
 CONFIG_TARGET_IO=y
 CONFIG_AUTOBOOT_KEYED=y
 CONFIG_AUTOBOOT_STOP_STR=" "
-CONFIG_CMD_SETEXPR=y
-CONFIG_CMD_NET=y
+# CONFIG_CMD_NFS is not set