Add package checking with Uid in EuiccController#getEid

EuiccController does not validate the calling package name
(i.e. to ensure that it is owned by the calling UID). It is
therefore possible for an app to effectively gain carrier
 privileges in the call to EuiccController#getEid by
passing the package name of another app that does has carrier
 privileges to one or more subscriptions.

Test: safe net log
Bug: 159062405
Change-Id: I0bf7c8b267a0c9cd877328c4ff3169950e1ff64f