Fix crash on GATT service unregistration

When SDP_MAX_RECORDS were reached in SDP db, which usually happen by
registering big number of GATT services, unregistration of a service was
causing a crash. This was because we moved from memory after the array
into last element.

Bug: 38265174
Test: manual
Change-Id: I7b0235213fb07c85dcc1245f1c840b41267521d5
(cherry picked from commit cac6fc59)