cmd: Remove <common.h> and add needed includes

Remove <common.h> from all "cmd/" files and when needed add
missing include files directly.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/ethsw.c b/cmd/ethsw.c
index f8b8a79..4bf49ac 100644
--- a/cmd/ethsw.c
+++ b/cmd/ethsw.c
@@ -5,13 +5,13 @@
  * Ethernet Switch commands
  */
 
-#include <common.h>
 #include <command.h>
 #include <env.h>
 #include <errno.h>
 #include <env_flags.h>
 #include <ethsw.h>
 #include <net.h>
+#include <vsprintf.h>
 
 static const char *ethsw_name;