terminalsize was loaded from a location added to sys.path during
bootstrap. This appeared to be causing import issues. There is no longer
a good reason for terminalsize to be loaded that way, so just moved it
under wlauto.utils so that it can be loaded normally.
- UEFI config can be specified as a device_config parameter
- The same config is used to create a missing UEFI entry, and
to re-create the entry when flashing. UEFI config now wholy
resides within the device and is not specified for vexpress
flasher.
