timers: Remove stale struct tvec_base forward declaration

struct tvec_base is a leftover of the original timer wheel implementation
and not longer used. Remove the forward declaration.

Signed-off-by: Liu Changcheng <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Cc: [e-mail]
Link: https://lkml.kernel.org/r/20180412075701.GA38952@sofia

include/linux/timer.h

···
 #include <linux/debugobjects.h>
 #include <linux/stringify.h>
 
-struct tvec_base;
-
 struct timer_list {
 	/*
 	 * All fields that change during normal runtime grouped to the