Fix discover service process using wrong transport

Application may use createBond by transport API to bond with a dual mode
device. If the stack doesn’t get a name from the adv packet, the
stack will start to discover remote name before discovering remote
service. As stack will clear the bta_dm_search_cb.transport flag after
searching remote name, the sdp protocol will be used to discover remote
services, but actually it should use gatt protocol.

Bug: 154299225
Test: Create bond with a dual mode device using le transport
Tag: #compatibility
Sponsor: optedoblivion@
Change-Id: I05b9fa9cf9801cf681e195d490d77d61f77e43a3