Get rid of on_name_read discovery callback

Name read happens during device search, not service discovery.
State machines were separated, so name and service discovery are now
separate.

Name read can be scheduled by btm_sec while connecting to encrypted
Classic link. If name is read this way, pass it to btif layer directly.

Bug: 330675788
Bug: 335732980
Flag: com.android.bluetooth.flags.separate_service_and_device_discovery
Test: mma -j32
Change-Id: Idfc3ded8dad8b77f457f817a7c7ab8beb2d5a894