Allow admins to configure aliases for device-types and provide an API
to lookup the device-type name by the alias (or a string contained
within the alias name).
Add documentation of how this can be used to relate device tree
names to device-type names whilst keeping device-type names which
are easily understood by humans. Device types can have any number
of aliases and some aliases can relate to multiple device types.

Change-Id: I1b2e877acb810addf82c4cafbc214b889a5cd110