Make eUICC SubInfo refreshes blocking.

Otherwise, after a profile download/delete completes and returns
control to the caller, the SubscriptionInfo may not be in a complete
state. For example, a newly-downloaded profile will not return true in
SubscriptionInfo#isEmbedded() until this refresh completes.

Fixes: 62547811
Test: TreeHugger / verified bug fix
Change-Id: I40ef30feb3dce94ed456abe930749e9c30da6d96