Let's set the "src" (RTA_PREFSRC) of DHCP routes. This helps with source address selection.
This can matter if the interface also has static addresses configured.
Systemd-networkd also does this ([1], [2]).
[1] https://github.com/systemd/systemd/commit/ac2dce5f36bb8b1a877ff765e6a4dfde6bfb2d49 [2] https://github.com/systemd/systemd/blob/5b89bff55f45235f72d30d90fd489fe2247ad00d/src/network/networkd-dhcp4.c#L395
Related: https://bugzilla.redhat.com/show_bug.cgi?id=1995372