Telephony: Get SIM card capacity count of SMS.

Add one API:
- getSmsCapacityOnIcc: get the capacity of stored SMS on ICC card.

CRs-Fixed: 645022
Change-Id: I8064d694d35c4200074a24ee4159d09ecb2a779c
Revert "Fix occassional hotboot with reboot dialog activity"

Two activities can't have the foreground at the same time.

This reverts commit 9e419fb434ecb7a36541ab2cda9fb914b0827426.