Added set() and get() methods for variables that need lock.

Added set() and get() for following variables:
- mSubsInfoListPerPriority
- mLastEvaluatedSubscriberProvisionStatus
- mLastConfiguredIccId

Bug: 409608013
Test: atest
Flag: com.android.internal.telephony.flags.satellite_improve_multi_thread_design
Change-Id: I7dc2dc29855d4a995d093998d0041917a85565d5