sd-hwdb: order properties by origin

sd-hwdb: order properties by origin

If we find duplicates in a property-lookup, make sure to order them by
their origin. That is, matches defined "later" take precedence over
earlier matches. The "later"-order is defined by file-name + line-number
combination. That is, if a match is defined below another one in the
same hwdb file, it takes precedence, same as if it is defined in a file
ordered after another one.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>