nimble/host/sm: rename remaining BLE_SM_SC_LVL to BLE_SM_LVL
nimble/host/sm: rename remaining BLE_SM_SC_LVL to BLE_SM_LVL

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble