Maintaining usb manufacturer and product name configurations for multiple
devices is cumbersome and time consuming. It also duplicates effort that
is needed for ssu configuration anyway.

When possible, override usb-moded manufacturer and product name
configuration by using data provided by ssu D-Bus service.

The feature is optional and needs to be enabled at usb-moded build
time via "--enable-mer-ssu" configure option.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>