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/x86/mtrr.c b/cmd/x86/mtrr.c
index 6ad7a12..b2afb59 100644
--- a/cmd/x86/mtrr.c
+++ b/cmd/x86/mtrr.c
@@ -3,9 +3,9 @@
  * (C) Copyright 2014 Google, Inc
  */
 
-#include <common.h>
 #include <command.h>
 #include <log.h>
+#include <vsprintf.h>
 #include <asm/msr.h>
 #include <asm/mp.h>
 #include <asm/mtrr.h>