linuxkpi: Add `iosys_map_memcpy_from()` and `iosys_map_{rd,wr}*()`

[dumbbell]

Summary

Why

The i915 DRM drivers started to use it in Linux 5.18.

This is part of the update of the DRM drivers to Linux 5.18.

[emaste]

iosys-map.h added in f8ab2f5bae1d4 but does not have this change

[emaste]

iosys-map.h added in f8ab2f5bae1d4 but does not have this change

Oops, it does have the defines but not iosys_map_memcpy_from

[emaste]

sys/compat/linuxkpi/common/include/linux/iosys-map.h

61

Is this the right direction? The destination is system memory, the src is iosys_map.