common: Move wait_ticks functions out of common.h

This function belongs in time.h so move it over and add a comment.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/common.h

@@ -286,7 +286,6 @@ int cleanup_before_linux_select(int flags);
 
 /* arch/$(ARCH)/lib/ticks.S */
 uint64_t get_ticks(void);
-void	wait_ticks    (unsigned long);
 
 /* lib/uuid.c */
 #include <uuid.h>