sysota: move to booting.oniroproject.org, update

Update both the git repository and the Go import path to the new
booting.oniroproject.org repository. The source revision change reflects
the updated D-Bus branding inside SystemOTA, which moves from an OSTC
well-known bus name to one named after Oniro, as well as bug fixes for
initial boot configuration logic.

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>