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/drivers/net/Kconfig b/drivers/net/Kconfig
index 973258a..ce76a02 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -11,6 +11,7 @@
 menuconfig NETDEVICES
 	bool "Network device support"
 	depends on NET
+	default y if DM_ETH
 	help
 	  You must select Y to enable any network device support
 	  Generally if you have any networking support this is a given