nvidia-drm-515-kmod: Fix build on CURRENT with iosys-map.h

[ashafer_badland.io]

Summary

Commit f8ab2f5bae1d added the linux/iosys-map.h header to base in order
to support 5.18+ versions of drm-kmod. This messes with nvidia-drm's
conftest logic as on recent enough CURRENT versions it will see iosys-map
and assume it can use it, but the drm-kmod version in use is 5.15,
which wants to use the older dma_buf_map.

This adds a patch on the port side to override nvidia-drm's detector
and force the use of dma_buf_map on the 5.15 port.

[ashafer_badland.io]

I know there's a lot of updates to the DRM infrastructure (terrific btw!) happening so feel free to ping me if there's anything you think might break nvidia-drm and you want me to test. I've verified 6.1-lts builds with nvidia-drm fine and I plan on testing that on my machines at some point soon.

[manu]

You might want to bump PORTREVISION too assuming the current port version builds fine but don't work.

[ashafer_badland.io]

It doesn't build, I got notified of this by a failing build: https://pkg-status.freebsd.org/beefy18/data/main-amd64-default/p384f6f077a9c_s1ff41cad71/logs/nvidia-drm-515-kmod-535.104.05_2.log

[manu]

In D43234#985357, @ashafer_badland.io wrote:

It doesn't build, I got notified of this by a failing build: https://pkg-status.freebsd.org/beefy18/data/main-amd64-default/p384f6f077a9c_s1ff41cad71/logs/nvidia-drm-515-kmod-535.104.05_2.log

Ok thanks, will commit this then.