MAP-MNS: Cleanup sdp record on service shutdown

* Obtain, check and save SdpManager instance
* Save SdpHandle and remove SDP record on stop()

Bug: 67753878
Test: build
Change-Id: I21f45c553ee1ff3fdf4bde71d4dcc1c0c62c3871
(cherry picked from commit 780f9cea48424646af1c5f9b3a53cabbe8e57d6c)
Merged-In: I21f45c553ee1ff3fdf4bde71d4dcc1c0c62c3871