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/itest.c b/cmd/itest.c
index 74414cb..b79512a 100644
--- a/cmd/itest.c
+++ b/cmd/itest.c
@@ -11,11 +11,11 @@
  * A few parts were lifted from bash 'test' command
  */
 
-#include <common.h>
 #include <config.h>
 #include <command.h>
 #include <env.h>
 #include <mapmem.h>
+#include <vsprintf.h>
 
 #include <asm/io.h>