On PowerPC (and possibly other architectures), that doesn't use EARLY_AP_STARTUP, the config task queue may be used initialized.
This was observed while trying to mount the root fs from NFS, as reported here: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230168.
This patch has 2 main changes:
1- Perform a basic initialization of qgroup_config, similar to what is done in taskqgroup_adjust, but simpler. This makes qgroup_config ready to be used during NFS root mount.
2- When EARLY_AP_STARTUP is not used, call inm_init() and in6m_init() right before SI_SUB_ROOT_CONF, because bootp needs to send multicast packages to request an IP.