We have reports that iwlwifi(4) works on RISC-V. While we can turn off
full ACPI-specific files easily, intermittent code still relies on the
header files to be present. In order to not need to completely #ifdef
everything out we want to include acpi.h from LinuxKPI and as a result
need this file. With this the iwlwifi(4) code compiles just fine and
will do the right thing (given the functional ACPI parts are disabled/
unavailable).
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