Remove unused vars tBTM_CB::tBTM_BLE_CB::tBTM_BLE_INQ_CB

tBTM_CB::tBTM_BLE_CB::tBTM_BLE_INQ_CB::num_bd_entries
tBTM_CB::tBTM_BLE_CB::tBTM_BLE_INQ_CB::max_bd_entries

Towards readable code

Bug: 163134718
Tag: #refactor
Test: acts -tc BleCocTest
Test: ble paired 2 phones

Change-Id: I6abb23191fb4cdfe7a175862e01643b497297afb