LinuxKPI: Remove FreeBSD struct resource from all LKPI headers

except linux/pci.h to avoid conflicts with Linux version.
This allows to #define resource in drm-kmod globally and strip some #ifdef-s

Reviewed by: hselasky, manu
Differential revision: https://reviews.freebsd.org/D31673

(cherry picked from commit 66ea390652d2ede405b43c168157986bd2b52bb9)