rtw89: make wow.c compile

So far we have not compiled wow.c given we do not enable CONFIG_PM
yet.
Make the necessary file local adjustments to make the file compile
once further changes in LinuxKPI 802.11 code are comitted.

Sponsored by: The FreeBSD Foundation

(cherry picked from commit 848fdcae0326db5b7c3edd2e8c264d25254abe1d)