Expose setUiccApplicationsEnabled as @SystemApi for eSIM to call upon slot

mapping change.

Because currently we rely on eSIM module to do handle some slot mapping
change and single to dual SIM config change, eSIM needs to also make
sure uicc applications are enabled for certain scenarios. So we expose
the SubscriptionManager#setUiccApplicationsEnabled as @SystemApi

Bug: 141018421
Test: unittest
Change-Id: I9844e71260ea009afd0928a0f4be4426e7d12358