Moved pollState triggering back into SST

After carrier config changes, pollState should
be triggered again because several overridings
(e.g. roaming/non-roaming, carrier brand name)
are controlled by carrier config. Right now
this is triggered from GsmCdmaPhone instead of
in SST's carrier config changed callback method.
Moved this logic into SST and did some cleanup
works.

Also moved EriManager into ServiceStateTracker
since the original loading eri + triggering
poll state is moved into ServiceStateTracker.

Bug: 119076643
Test: Manual

Merged-In: If720ccb6ed8943ed62e0f1ca041a1b977272fb0a
Change-Id: If720ccb6ed8943ed62e0f1ca041a1b977272fb0a
(cherry picked from commit 1cd2710c)