libxl: Unconditionally call virSysinfoRead() on driver init

No need to check if privileged when reading hostsysinfo, since
that check was already done in libxlDriverShouldLoad().  The
libxl driver fails to load if not privileged.

src/libxl/libxl_driver.c

@@ -873,7 +873,6 @@ libxlStateInitialize(bool privileged,
     }
 
     /* read the host sysinfo */
-    if (privileged)
     libxl_driver->hostsysinfo = virSysinfoRead();
 
     libxl_driver->domainEventState = virDomainEventStateNew();