init: Start snapuserd_proxy after early-init

When service is started prior to early init and if per-app memcg is enabled, service start will fail as the required directories for memcg isn't present viz /dev/memcg/apps.

Bug: 308818430
Test: th and CF OTA test with per-app memcg enabled
Change-Id: Ic65e8d179fbfb8e2135f2de5cc7c77d6c29ea7d2
Signed-off-by: Akilesh Kailash <akailash@google.com>