Fix an error in r215067. An existing /chosen/mmu but missing translations property just means we shouldn't add any translations, not that we should panic.
Fix an error in r215067. An existing /chosen/mmu but missing translations
property just means we shouldn't add any translations, not that we should
panic.

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