Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (M of N)

[kaktus]

Summary

r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are still not MPSAFE (or already are but aren’t properly marked). Use it in preparation for a general review of all nodes.
This is non-functional change that adds annotations to SYSCTL_NODE and SYSCTL_PROC nodes using one of the soon-to-be-required flags.

You’re asked for a review based on src/MAINTAINERS entry.

[kaktus]

sys/dev/drm2/drm_sysctl.c

105

MPSAFE