common: Move command functions out of common.h

Move these functions into the command.h header file which is a better fit.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/usb/gadget/f_thor.c b/drivers/usb/gadget/f_thor.c
index 920fa52..5a023a2 100644
--- a/drivers/usb/gadget/f_thor.c
+++ b/drivers/usb/gadget/f_thor.c
@@ -14,6 +14,7 @@
  * Sanghee Kim <sh0130.kim@samsung.com>
  */
 
+#include <command.h>
 #include <errno.h>
 #include <common.h>
 #include <console.h>