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/2048.c b/cmd/2048.c
index fa60aa9..42cd171 100644
--- a/cmd/2048.c
+++ b/cmd/2048.c
@@ -3,10 +3,10 @@
 
 /* Console version of the game "2048" for GNU/Linux */
 
-#include <common.h>
 #include <cli.h>
 #include <command.h>
 #include <rand.h>
+#include <vsprintf.h>
 #include <linux/delay.h>
 
 #define SIZE 4