meta-phytec

tools: phytec-setup-release: make POSIX compliant

The init script fails on machines where sh is not symlinked to bash. As
scripts in Yocto try to stay POSIX compliant, which increases
compatibility with linux distributions, remove the bashishms "source"
and argument handling.

Signed-off-by: Stefan Müller-Klieser <s.mueller-klieser@phytec.de>
(cherry picked from commit be497ba096bbb0c878047a38e2bfd400158dd4ce)