Fix pmap_unmapdev() to call pmap_kremove() instead of implementing it directly so that it more closely mirrors pmap_mapdev() which calls pmap_kenter().
Fix pmap_unmapdev() to call pmap_kremove() instead of implementing it
directly so that it more closely mirrors pmap_mapdev() which calls
pmap_kenter().

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase