linuxkpi: Add io_mapping_map_local_wc() and io_mapping_unmap_local()

io_mapping_map_local_wc() is synonymous to io_mapping_map_atomic_wc().

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38156

(cherry picked from commit 29d0c85c86347cd3eafe3c8974c693abf8d9ca51)