Makefile.am: add some more test files to the dist tar.xz
Makefile.am: add some more test files to the dist tar.xz

Compared to the git repository there are a few files missing in the 1.7
tarball. Add them to EXTRA_DIST.

Signed-off-by: Uwe Kleine-König <181323dd666a182bc2d953e52d0ac3ab54cd8391@pengutronix.de>

rauc/rauc,jluebbe/rauc,jluebbe/rauc,ejoerns/rauc,ejoerns/rauc,ejoerns/rauc,rauc/rauc,rauc/rauc,jluebbe/rauc