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/README b/README
index c3fa549..8109e5d 100644
--- a/README
+++ b/README
@@ -1048,9 +1048,7 @@
 		Monitor commands can be included or excluded
 		from the build by using the #include files
 		<config_cmd_all.h> and #undef'ing unwanted
-		commands, or using <config_cmd_default.h>
-		and augmenting with additional #define's
-		for wanted commands.
+		commands, or adding #define's for wanted commands.
 
 		The default command configuration includes all commands
 		except those marked below with a "*".