linuxkpi: pm: Add more defines and includes

Needed by drm-kmod.

Reviewed By: emaste, hselasky
Obtained from: drm-kmod
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D36024

(cherry picked from commit 2ff0f051498aadfe119149ae3720bef58846f3b2)