Split uicc records loading in two groups.

Add the apis related to split of UICC records in two
groups. The first group constitutes records knowns as essential records.
Basically, essential from the data call establishment perspective. Remaining
records are moved to second group.

Records reading is sequential so essential records are read prior to other records.

Also introduced registrant apis to get notified when these few essential records
are read. SIM, RUIM and ISIM identified different set of records as essential.

The current grouping is based on heuristic and can be tuned in future based on
field trials.

Change-Id: Ic8fa54b33f97365999bd19dcfcfed319bc88a0ab
CRs-Fixed: 2568904