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>

cmd/broadcom/chimp_boot.c

@@ -3,7 +3,6 @@
  * Copyright 2020 Broadcom
  */
 
-#include <common.h>
 #include <command.h>
 #include <broadcom/chimp.h>
 

cmd/broadcom/chimp_handshake.c

@@ -3,7 +3,6 @@
  * Copyright 2020 Broadcom
  */
 
-#include <common.h>
 #include <command.h>
 #include <broadcom/chimp.h>
 

cmd/broadcom/nitro_image_load.c

@@ -3,8 +3,8 @@
  * Copyright 2020 Broadcom
  */
 
-#include <common.h>
 #include <command.h>
+#include <vsprintf.h>
 
 #define FW_IMAGE_SIG	0xff123456
 #define CFG_IMAGE_SIG	0xcf54321a