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/blkcache.c b/cmd/blkcache.c
index 1456654..dbd03df 100644
--- a/cmd/blkcache.c
+++ b/cmd/blkcache.c
@@ -6,9 +6,9 @@
  */
 #include <command.h>
 #include <config.h>
-#include <common.h>
 #include <malloc.h>
 #include <part.h>
+#include <vsprintf.h>
 
 static int blkc_show(struct cmd_tbl *cmdtp, int flag,
 		     int argc, char *const argv[])