syslog-ng: fix a multilib build failure and a QA issue
syslog-ng: fix a multilib build failure and a QA issue

* Use BPN instead of PN to fix the multilib build failure:
ERROR: Function failed: SYSTEMD_SERVICE_lib32-syslog-ng value
lib32-syslog-ng.service does not exist

* Do not add syslog-init for systemd to fix the QA issue:
WARNING: syslog-ng: alternative target (/etc/init.d/syslog or
/etc/init.d/syslog.syslog-ng) does not exist, skipping...
WARNING: syslog-ng: NOT adding alternative provide /etc/init.d/syslog:
/etc/init.d/syslog.syslog-ng does not exist
WARNING: alt_link == alt_target: /etc/init.d/syslog ==
/etc/init.d/syslog

Signed-off-by: Jackie Huang <49ec7cfe045884df7178a7e982697c7043dbc82b@windriver.com>
Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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