riscv: Fixup lockdep_assert_held with wrong param cpu_running

The cpu_running is not a lock-class, it lacks the dep_map member in
completion. It causes the error as follow:

arch/riscv/kernel/smpboot.c: In function '__cpu_up':
./include/linux/lockdep.h:364:52: error: 'struct completion' has no member named 'dep_map'
  364 | #define lockdep_is_held(lock)  lock_is_held(&(lock)->dep_map)
      |                                                    ^~
./include/asm-generic/bug.h:113:25: note: in definition of macro 'WARN_ON'
  113 |  int __ret_warn_on = !!(condition);    \
      |                         ^~~~~~~~~
./include/linux/lockdep.h:390:27: note: in expansion of macro 'lockdep_is_held'
  390 |   WARN_ON(debug_locks && !lockdep_is_held(l)); \
      |                           ^~~~~~~~~~~~~~~
arch/riscv/kernel/smpboot.c:118:2: note: in expansion of macro 'lockdep_assert_held'
  118 |  lockdep_assert_held(&cpu_running);

There are a lot of archs which use cpu_running in smpboot.c (arm,
arm64, openrisc, xtensa, s390, x86, mips), but none of them try
lockdep_assert_held(&cpu_running.wait.lock). So Just remove it.
Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

arch/riscv/kernel/smpboot.c

@@ -121,7 +121,6 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 
 	ret = start_secondary_cpu(cpu, tidle);
 	if (!ret) {
-		lockdep_assert_held(&cpu_running);
 		wait_for_completion_timeout(&cpu_running,
 					    msecs_to_jiffies(1000));