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/sleep.c b/cmd/sleep.c
index c741b4a..7616fed 100644
--- a/cmd/sleep.c
+++ b/cmd/sleep.c
@@ -4,9 +4,10 @@
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  */
 
-#include <common.h>
 #include <command.h>
 #include <console.h>
+#include <time.h>
+#include <vsprintf.h>
 #include <linux/delay.h>
 
 static int do_sleep(struct cmd_tbl *cmdtp, int flag, int argc,