This patch should be merged after 25841 has been merged.
https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl-devel/+/25841
xpath is used in launch_xml2cfg.sh. launch_xml2cfg.sh converts xml to cfg.
Originally, agl.mk was running launch_xml2cfg.sh. Only SystemManager uses
launch_xml2cfg.sh. Therefore, I changed launch_xml2cfg.sh from agl.mk to
SystemManager's Makefile.
Signed-off-by: Riku Nomoto <riku_nomoto@mail.toyota.co.jp>
Change-Id: Ib4c5813c89573222217a6df971b720f9be35fc3f