efibootmgr from home:westhusing:MAAS:15.5 project

需要 15.5 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/home:westhusing:MAAS:15.5/15.5/home:westhusing:MAAS:15.5.repo
zypper refresh
zypper install efibootmgr