linuxkpi: Add arch_io_{reserve,free}_memtype_wc
Reviewed by: hselasky
Obtained from: drm-kmod
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D36022
(cherry picked from commit 789dbdbb485749340110be550a03c6df22bc9c9c)