linuxkpi: Add `io_mapping_map_user()` and `remap_pfn_range()`

[dumbbell]

Summary

The code comes from the i915 DRM driver.

In Linux commits b739f125e4ebd73d10ed30a856574e13649119ed and b12d691ea5e01db42ccf3b4207e57cb3ce7cfe91 (Linux 5.13), the i915 DRM driver dropped specific implementations to use Linux generic functions. Therefore I moved the FreeBSD code from that i915 driver to linuxkpi.

However, these commits were later reverted (also in Linux 5.13) so the i915 driver doesn't use these functions. But perhaps it will help in the future.

To sum up, the code comes from the i915 DRM driver but it doesn't it (i.e. it continues to use its internal implementation).

This is part of the update of the DRM drivers to Linux 5.13 but is not required for it.