Major update to drm(4) code in OpenBSD-current (to linux 6.18.16)

@pitrh I wonder if this will fix the issue I was having with the Intel DRM driver eating my CPU when no monitor is attached. I'm seeing a bunch of commits in drm/i915! Very cool that this work was sponsored by the OpenBSD Foundation.

https://ratfactor.com/openbsd/blog-11-openbsd-disable-inteldrm

OpenBSD Blog #11: Disabling Direct Rendering Manager on OpenBSD - ratfactor

@ratfactor @pitrh Good luck! Also that’s really a interesting find, I’m wondering if your problem here is linked to my problem where certain machines won’t complete a sysupgrade until I attach a monitor. Here’s hoping it fixes all the problems!