Add debian/apertis/copyright

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

debian/apertis/copyright

+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+
+Files: *
+Copyright: 2015, Robert Bosch Car Multimedia GmbH
+License: MPL-2.0
+
+Files: debian/usr.bin.prestwood
+Copyright: no-info-found
+License: MPL-2.0
+
+Files: git.mk
+Copyright: 2015 Robert Bosch Car Multimedia GmbH
+License: MPL-2.0