MDEV-11695 Define a reasonable upper limit for innodb_spin_wait_delay

The upper limit of innodb_spin_wait_delay was ~0UL. It does not make
any sense to wait more than a few dozens of microseconds between
attempts to acquire a busy mutex.

Make the new upper limit 6000. ut_delay(6000) could correspond to
several milliseconds even today.

storage/innobase/handler/ha_innodb.cc

@@ -22615,7 +22615,7 @@ static MYSQL_SYSVAR_ULONG(sync_spin_loops, srv_n_spin_wait_rounds,
 static MYSQL_SYSVAR_ULONG(spin_wait_delay, srv_spin_wait_delay,
   PLUGIN_VAR_OPCMDARG,
   "Maximum delay between polling for a spin lock (6 by default)",
-  NULL, NULL, 6L, 0L, ~0UL, 0);
+  NULL, NULL, 6, 0, 6000, 0);
 
 static MYSQL_SYSVAR_ULONG(thread_concurrency, srv_thread_concurrency,
   PLUGIN_VAR_RQCMDARG,